Chaos Legion - Really unique and pretty addictive in a more arcadey sort of way. Absolutely dreadful voice acting but in the best possible way, but it's definitely a love it or hate it kind of thing I think.
Curse of Darkness is so underrated. On a technical level it's not the most groundbreaking game or anything, but it has so much to do and a lot of personality. The weapon system adds a lot of replayability and the Devil summons are really enjoyable to use. There's some really, really good boss fights in here too.
Bujingai is sort of in the vein of crossing DMC with Ninja Gaiden, and like NOBODY seems to have heard of it. It's really fun and pretty intense.
Van Helsing is only slightly longer than the movie (maybe twice as long on a first playthrough) and it's very derivative... but holy shit, this is super fucking fun to play. I can't say it has tons of replay value, but there definitely is a little. It has unlockable "glyphs" that are basically the same stuff you'd normally get from old school cheat codes, which I thought was a particularly nice touch. Trust me, play this.
Darkwatch is a haunted wild west shooter that is loads of fun and just the essence of cool. It also has a really fun multiplayer mode... as long as you don't have a friend who gets a
lot out of taking advantage of the friendly fire a little too much... >> Not me or anything, I totally didn't ruin the experience for
@Mr. Daddy once I got my hands on the rocket launcher.
Also, thanks to my wife
@King Koopa for introducing this to me.