I tend to forget what the shelfwarmers were over here... But here goes:
ROTF Deluxe Mudflap: I never picked it up until TRU marked it down to $6 2 years later. It is actually a good figure!
DOTM deluxe Bee: Not half bad, but they produced too damn many of it. So they were asking for it.
Animated Oil Slick: I like him, I guess people are turned off by his ugly face.
Generations Thunderwing: It's a plane... and a robot. Why didn't it sell well? Probably because it was not realistic enough in plane mode, or robotic in bot mode.