I love the game (so much so that I aspire to conquer the leaderboards, im currently second as far as my overall career score is concerned), but I don't know if I would say the same if I wasn't a huge fan of the show...I'd say it would really only appeal to fans...
I don't know why they made it "lemmings" style gameplay, and the violence is heavily toned down from the show, I think a different genre of game might have worked better and fitted in more with HTF's theme...I would rather directly play as my favourite character (Flaky), as opposed helping five of them through a level...speaking of which "helping" doesn't seem to be a reacurring theme in the HTF universe, i am surprised the game doesn't revolve around maiming the HTF...