My ratings.
Jade Coast - 9/10
This is one of my favorite stages. It is a good beginning for the new player. The great bunch of secrets are awesome. What doesn't deserve a point is the song, that is sticky and annoying.
Tempest Valley - 8/10
The stage is good because of its multiple paths and secrets. The song is remarkable. What makes the stage poor is because the player is always in danger. Buzzes, Crawlas, slime here and there always almost killing the player is not a good choice for second stage.
Verdant Forest - 8/10
The song is beautiful and remarkable. The stage has a pretty design and good enemies usage. What breaks everything is that the player gets lost constantly. By myself when I was playing by the first time got lost many times.
Flame Rift - 7/10
It really needs challenges. I can end this stage in seconds with Tails, cause it's all filled with nothing. Crawlas down there, lava... Nothing more than that. Ah! There are staircases. Ah, and a cave. Torches. What saves the stage is the song.
Midnight Freeze - 7/10
The song is good, but the stage is weak. The secrets are also good, but the stage is still weak. If Sonic falls down, has to make ALL the way back to the ice platforms. It is annoying.
Sunken Plant - 10/10
One of my favs. Secrets everywhere. The song is beautiful and the design is great. Nothing negative.
Aerial Garden - 8/10
Aerial Garden is one of my favs, but the problem is the amount of Jetty-syns. However it is in the sky, it looks like it came from hell, cuz Sonic suffers toughly. Extra tiny platforms for landing and awful secrets. Help. I fell down.
Prismatic Angel - 9/10
However it is a stage for Sonic, it is good to play. It tests our skills. And the song hypnotizes. I love Prismatic Angel cuz it's colorful. Cute :3
Mystic Realm - 6/10
Kim: Beautiful song, isn't it, Kari?
Kari: Yeah. Pretty cool.
Kim: Let's get doing it. My rings are ending.
Kari: Careful there...
Kim: Damn! I released the spindash button!
Kari: Don't worry, you have 5 lives left.
Kim: Again...
Kari: Whoa! Kim, the column!
Kim: Damn! Sonic fell again!
Kari: 4 lives...
Kim: *singing Mystic Realm song*
Kari: Kim? Watch out!
Kim: Uh...
Kari: OoOo Hall of Mirrors!
Kim: Where? Ah, I released it again! Damn!
1 hour later
Kim: OoOo Egg Crystal.
Kari: Cute!
Kim: He's throwing green rings!
Kari: Can't you throw yours?
Kim: *facepalm*
Kari: Nevermind. Going to the kitchen.
Kim: I will play EHF.
These were my ratings :D