I wasn't a devoted fan of these guys, but I did like them better than the Beatles(sorry, Raph!)
Peter was my favorite! I considered him the "Mikey" of the group because of his playful nature and outright crazyness!
I loved their parodies too! They were almost as good as the cartoons that came on back then.
I guess, "I'm a Believer" would be my favorite song, since "Shrek" resurrected it in the first movie and it's stuck in my head!

The episodes are a blur to me now. I'll have to do some catching up on You Tube, or something.