Sonic The Hedgehog

[Dr. Ensatsu-ken]

Well let's see:

Sonic 3
Angel Island Zone- Like it
Hydrocity Zone- Like it
Marble Garden Zone- Kind of like it, but some parts are sort of "meh"
Carnival Night Zone- Hate it
Ice Cap Zone- Love it
Launch Base Zone- Same as MGZ

Sonic & Knuckles
Mushroom Hill Zone- Love it
Flying Battery Zone- Love it
Sandopolis Zone- Like Act 1; Don't care for Act 2
Lava Reef Zone- Love it
Hidden Palace Zone- Filler level which I'm indifferent to
Sky Sanctuary Zone- Also kind of filler-ish, but has enough gameplay in it to be fun
Death Egg Zone- Like it

Overall I'd say S&K is a bit stronger than the first half, but only both games together make this my favorite Sonic game.

[talonmalon333]

Sky Sanctuary Zone- Also kind of filler-ish, but has enough gameplay in it to be fun

The main reason I really like this place is the aesthetics. I love the level's music in particular.

[Dr. Ensatsu-ken]

The Music and look of the level is great. The actual gameplay, by comparison, though, is pretty average by 2D Sonic standards. This is actually the only classic Sonic level in which I liked the "classic" Generations version better for having better level design and gameplay, and not feeling like filler. The 3D portion of that level was ass, though. I hate most bottomless pit-heavy levels in 3D platformers, and this one made most SAlevels look lenient in that regard.

[Spark Of Spirit]

I would probably put it below Colors as a whole package (it also has the filler problem but color score attacking in Colors gives it points) but at its best it's just so good. It's less restrictive than the boost games, either way.

As for the other question:

Sonic 3
Angel Island Zone - 5/5
Hydrocity Zone - 10/5
Marble Garden Zone - 4/5 (I always end up exploring this when I play it)
Carnival Night Zone - 3/5 (Act 2 brings it down)
Ice Cap Zone - 5/5
Launch Base Zone - 5/5

Sonic & Knuckles
Mushroom Hill Zone - 4/5
Flying Battery Zone - 5/5
Sandopolis Zone - 3/5 (Act 2 is soooooo long)
Lava Reef Zone - 10/5
Hidden Palace Zone - 5/5 (it's filler but I like it)
Sky Sanctuary Zone - 5/5
Death Egg Zone - 5/5

Doomsday Zone - 5/5 (Only Super Sonic boss fight I've ever liked in the series)

[King Hippo]

How would you rate the Sonic 2 levels?

My personal favorite is Chemical Plant, just because of how fast and zany the whole place feels.

My least favorite? Same as everyone else's, Metropolis.

[Spark Of Spirit]

Oh, good idea. I'll throw in Sonic 1 for fun.

Sonic 1
Green Hill Zone - 5/5
Marble Zone - 3/5 (Act 3 could be shorter)
Spring Yard Zone - 5/5
Labyrinth Zone - 2/5 (if it wasn't for Act 2 and the boss, it would be higher)
Starlight Zone - 5/5
Scrap Brain - 5/5

Sonic 2
Emerald Hill Zone - 5/5
Chemical Plant Zone - 5/5
Aquatic Ruin Zone - 3/5 (This level continually punishes you for going fast and makes it way too difficult to stay out of the water)
Casino Night Zone - 5/5
Mystic Cave Zone - 4/5
Hill Top Zone - 3/5
Oil Ocean Zone - 2/5
Metropolis Zone - 1/5 (It gets one for the music and the screws)
Sky Chase Zone - 3/5 (Interesting distraction)
Wing Fortress Zone - 2/5 (Wow, is this boring)
Death Egg Zone - 1/5 (This will be controversial)

I'd do Sonic CD, but since I never play it the same each time I play it I couldn't rank them properly.

[Dr. Ensatsu-ken]

Sonic 1 (Overall - 3/5)

Green Hill Zone - 3/5
Marble Zone - 2/5
Spring Yard Zone - 4/5
Labyrinth Zone - 1/5
Starlight Zone - 5/5
Scrap Brain - 4/5

Sonic 2 (Overall - 4/5)

Emerald Hill Zone - 5/5
Chemical Plant Zone - 5/5
Aquatic Ruin Zone - 3/5 (Staying out of the water is easy, Desensitized just sucks at it )
Casino Night Zone - 5/5
Mystic Cave Zone - 5/5
Hill Top Zone - 3/5
Oil Ocean Zone - 4/5
Metropolis Zone - 2/5
Sky Chase Zone - 3/5
Wing Fortress Zone - 4/5 (Couldn't disagree more with Desensitized on this one)
Death Egg Zone - 3/5

[talonmalon333]

Emerald Hill - 5/5
Chemical Plant - 5/5
Aquatic Ruin - 4/5
Casino Night - 10/5 (by far my favorite stage in the whole series)
Hill Top - 4/5
Mystic Cave - 5/5
Oil Ocean - 4/5
Metropolis - 2/5
Sky Chase - 3/5
Wing Fortress - 3/5
Death Egg - Does this even count?

[Spark Of Spirit]

According to gunswordfist the Sonic 2 Death Egg is better than the S3&K one, so I would have to rank it to be fair. 

Also, my personal favorite Sonic 2 stage is Chemical Plant. It gives you so many paths and options, but staying out of the water is actually fun in this zone.

[Nel_Annette]

Not when you're 3! 

[talonmalon333]

Why does it matter what GSF says? GSF should be ignored until the day he dies.

[Kiddington]

Well he does think Spark and Desen are two different people, so... 

Anyway...

Sonic 1

Green Hill Zone - 5/5
Marble Zone - 3/5
Spring Yard Zone - 5/5
Labyrinth Zone - 4/5 (always really liked this level compared to most)
Starlight Zone - 5/5
Scrap Brain Zone - 4/5 (Act 3 get's a 5 for creativity though)

Sonic 2

Emerald Hill Zone - 3/5
Chemical Plant Zone - 10/5 (it's just that good)
Aquatic Ruin Zone - 3/5
Casino Night Zone - 5/5
Hill Top Zone - 2/5 (boring, should've kept this in the game instead)
Mystic Cave Zone - 4/5
Oil Ocean Zone - 3/5 (get's an extra point for music)
Metropolis Zone - 1/5 (get's ONLY point for music)
Sky Chase Zone - 3/5
Wing Fortress Zone - 4/5 (would've been better with a second act, but still good)
Death Egg Zone - Uhh... 2/5?

Sonic 3/Knuckles

Angel Island Zone - 5/5
Hydrocity Zone - 4/5 (could've done with a bit more underwater play IMO, as I've always loved water levels myself, but still fun)
Marble Garden Zone - 3/5
Carnival Night Zone - 2/5 (I'd give Act 1 a 4, Act 2 just kills it though)
Ice Cap Zone - 10/5 (how is this not everyone's favorite level?)
Launch Base Zone - 3/5
Mushroom Hill Zone - 5/5
Flying Battery Zone - 5/5
Sandopolis Zone - 2/5 (again, Act 1 is great but Act 2 just really drags it down)
Lava Reef Zone - 5/5
Hidden Palace Zone - 3/5
Sky Sanctuary Zone - 4/5 (short, but still fun)
Death Egg Zone - 3/5

[gunswordfist]

Well let's see:

Sonic 3
Angel Island Zone- Yawn
Hydrocity Zone- Greatest Sonic water level ever
Marble Garden Zone- Kind of a pain
Carnival Night Zone- Annoying
Ice Cap Zone- Love it
Launch Base Zone- Like Angel Island Zone, it has ugly graphics

Sonic & Knuckles
Mushroom Hill Zone- Too long
Flying Battery Zone- Pretty good iirc
Sandopolis Zone- The first part is 'meh', 2nd part is the worst Genesis Sonic level ever
Lava Reef Zone- OK
Hidden Palace Zone- Filler level which I'm indifferent to
Sky Sanctuary Zone- Decent
Death Egg Zone- The gravity gameplay is only barely interesting, the annoying first boss that takes forever to kill itself is probably my least favorite Sonic boss I've ever faced, smashing Eggman's fingers isn't too much more fun, getting chased by Master Emerald blasting Egg Emperor is ok and chasing Eggman is exhilarating. You'd have to be a moron who won't play a game because it has no sequels to like S3 Death Egg more S2's.

[Spark Of Spirit]

Eh, two boring bosses and one that takes forever to die with no rings is not my idea of fun. At least in the 3&K Death Egg there are multiple paths all over and Super Sonic makes the fight faster.

Not when you're 3! 

Aquatic Ruin was even worse when I was a kid!

In all seriousness though, Sonic 2 is a great game.

[gunswordfist]

You have to be terrible at games if you are still have trouble not dying against Silver Sonic. About half of S3K's Death Egg is watching Sonic get propelled through the level by one or another gizmo or whatever in the level, including having to bounce forever in one part and the mini-boss is another pain. Not fun.