I must admit, I'm not a huge fan of FPSs, except for Borderlands, Crysis 2 and a couple of Call of Duty games that I have for PC (But I only play single player campaigns).
So, this week I got Call of Duty 3 for my PS2, and I'm having a very hard time trying to use the analog sticks to shoot. Gosh, how I missed the mouse to aim. I died a lot of times because I was trying to aim at the enemy and got shot in the act.
Is that a problem for you? How do you play your FPS games? Do you use keyboard + mouse or a controller?
Also, Call of Duty 3 is a very good game, I hope I get better at the analog sticks with time because it's so much fun.