I've just started playing MW2 and I do really like it - one thing I don't like too much is the match making is a bit off, I keep getting pitted against really really good people, and I'm still learning. :/
I've just managed to get FMJ on my UMP, I usually run around with UMP + Holo/FMJ, and stopping power, with a G23 as my secondary. Then my second setup is the TAR-21 w/ grenade\holo and thumper for when I'm on that really ****ing annoying map with the tunnels.
Also, anyone got any experiance with using Fragenstein or FragFX? Just FPS on the 6axis, albeit highly tuned and works well. I still can't react as well as I could if I was using a mouse.