The wisps never felt like power ups to me because they didn't actually power up sonic and add a little something to his game play, instead they completely changed his gameplay. I got so annoyed playing colors because each level was so inconsistent with how I played it. It seemed like every two seconds I was stopping my platforming groove just to use some stupid rocket or sticky wheel that just felt awkward. It is my opinion after all, and my opinion is that colors is just not fun to play. At least with Unleashed you only have to play the werehog during the werehog stages... not all the time. Generations, however, I thought was great. Also, if they have a problem with "hold right till you win" syndrome, then that's a problem with the level design.
I just really don't understand the mind-blowing praise that colors gets, personally. If you like it, cool, but I don't and I'm not "wrong" not to.
*also, I too like the gem hunting... and the big the cat stages...
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