Mostly LMF, but also RMF, SS, SB, CMF, AMF and DMF. I was always too short to be a CB, but played it a bit indoors and it was actually an awesome position for me.
As for my defending abilities, again, a lot of you are missing my point. I don't give up that many goals due to the speed merchant up the middle, but when I do all I'm saying is that the goals seemed undefendable and unrealistic, especially when the break away comes on the quick counter and the striker is miles away from any defender.
Also, it has been pointed out quite astutely by others that if you watch the way the AI defend when it is not you controlling the defender manually, that the CB who should be covering is often either way out of position, or moves out of position as the pass is coming over the top. This is quite simply a problem with the game, and it needs to be fixed. It's a no lose situation if it were fixed and made more realistic, because the only people who would suffer are those who constantly spam the through ball, and honestly even they would benefit in the long run because they would actually have to learn to play the game properly, with a bit of build up play, knocking it back and maintaining possession. And that's my final point (which I have already made) -- that I'm not complaining about losing, I'm complaining about the shite football people are playing online. It's just not fun to play against someone who plays like they know nothing about the real game and for whom winning is the only important thing even if it means playing like a noob.