I love Rayman 3's interpretation of the Glade of Dreams and feel like it tends to be a little underrated here on PC. The environments sparked a lot of "I wonder what's in the distance there" thinking in me back when I first played it as a bab, and the soundtrack is great - They actually took the time to make that beautiful rendition of the Fairy Council theme or to have different music play after defeating Begoniax, both very short segments where you wouldn't mind if they'd just continued the previous music.
I think a good example of Rayman 3's dedication to its art direction is the Hall of Mirrors - An area that required original assets and music, only to spend like 10 seconds in it. Could've easily been cut out and it wouldn't have made the game any worse.
I'm surprised that considering they took on the "hip and cool" approach they chose to keep Rayman situated in a still very magical world. I don't think the Madder intro cutscene reflects the game very well.

But that might also be why the game has aged much better than its competitors (For example, a mascot like Blinx feels horribly dated), which is another thing no one talks about: Rayman 3 still really holds up, even visually.