My friend and I had fun with Army of Two, even if it wasn't the best game in the world.
My other friend and I were about *this* close to digging out our own eyeballs with spoons when playing through Kane & Lynch 2. He was reviewing it for a site, so we had to get through it, but god... those were probably some of the worst gaming hours of my life.
Resistance 1 was alright, Rainbow Six is fun, Army of Two was also fun. Past that, I can't think of many else.