I'd overwhelmingly go with single player, since I don't play most MP games for a number of reasons. I do prefer a satisfying story mode with excellent gameplay and good graphics, over a MP where people exploit the weapons only to win, ragequitting, hate mail and insults thru the mic, bad winners and big egos, cheaters, people with bad connection, etc.
I try out the MP modes if I'm interested on them. If I like one and excel at it, I stick with it. If it has character customization, I definitely try it.
Now, if it's co-op, that's another story. Since I know my weaknesses with competitive MP, I always opt for co-op with my friend. Also, I tend to meet a lot of random good, helpful, good-spirited players co-op, with the occasional dick. Proabably I'm not made for a competitive playstyle, unless it's Versus Ops. I'm damn good there.








