Just tried everything off this site to have a go at single player, and still not worth playing, it's jerky and in certain areas the fps drops considerably, not to mention the splits between textures and the being able to see through walls when you walk next to them. I'm thinking that possibly the multiplayer runs better than the single player then? To be honest, if I wanted to play multiplayer I would rather play Goldeneye Source, but I'm waiting for v4.2, haven't played for a while so it will make the experience all the better.