Well, looking back, basically all the PS1 games were awesomely bad.
But recently, Safecracker (wii) which had surprisingly hardcore puzzles right from the start but piss poor design and graphics that would have been horrible renders 15 years ago.
Counter Force, also on Wii is so not worth buying, maybe not even worth a rental, but it's kind of awesomely bad.
I understand that Castle Crashers is meant to be played multiplayer, but single player, its awesomely bad.
Sigh. Altered Beast and Bad Dudes are pretty awesomely bad. They were flat out awesome, at the time, but now they're kind of just awesomely bad.