Hmm.
Do they have to be BAD or just not AAA?
I had a blast with Dark Messiah of Might and Magic, which got decidedly middling reviews all around. I think the reviewers should've tilted the rating up 1 point/10 (or equivalent on their scale) just for pure fun-factor. That game has some of the most insanely fun first person melee combat ever, and I don't care what anyone says, being able to kick and through furniture/whatever at your opponents is just gold. Really lends some hate to the fight.
It's the combo possibilities that make the game. Setting an enemy on fire and then kicking him into a pool to put him out, only to fire lightning into the water. Sneaking up behind a guy, silently backstabbing him, then throwing his body into his buddy, knocking him off a cliff. Freezing the floor so your enemies slip and fall, and then running them through.
it's kind of the same magic from BioShock, but with more potential for combat comedy.
It's too bad their awesome gameplay mechanic was glued to utterly forgettable characters and a cookie-cutter story. That game could've been a classic.