Gitaroo Man! Music game for the PS2. The graphics are awful, and the style is so bizarre and horrible that barely anyone wanted to touch the thing. But I swear, every last person I put in front of that game ended up loving it and needing to hunt down a copy of their own. They tried releasing it on the PSP, but it had the same problem--looking completely awful.
They need to take the core gameplay and the awesome music and put it into a new package, because they obviously have a great concept on their hands. That single game is basically the only reason I can't get rid of my PS2. They should at least stick it on PSN.
Currently playing:
Bloodbath Paddy Wagon Ultra 9