Looking for red rings in Colors was pretty awesome in Colors. While they're just kinda sitting in the math level paths in Generations, you have to use the color powers in some pretty unique ways to get to the alternate routes that usually hold them in Colors. I didn't even know Planet Wisp Act 4 had an alternate route through the level until I started looking for the red rings in that level.
I've learned to appreciate Colours a LOT more recently, especially since I started watching speedruns of it. Great level design.
Basically I hated Colours because it wasn't Unleashed Daytime, but when I stopped viewing it as such I started to like it a lot more