Couple notes on my end:
- I haven't ever done that well with console FPS's either, but I've adapted quite well to CoD4 for some reason. I don't really like the PC version in comparison. Whatever they did in developing CoD4 to be different from other console FPS games, they did it very well.
- Guns: The M16A is the best mid to long ranged gun available, hands down. The red dot sight makes it unstoppable. Add in Stopping Power and any other decent perk and you're god-like.
P90s are for punks.

(no offense Rocky) It's known as the "squirt gun." You can use it for an hour and watch your accuracy rating plummet. The real CoD4 players use shotguns. I like to do my killin' up close and personal.

I just got the Gold Shotgun again on my 2nd Prestige level. I'm up to lvl 43 I think now.
- Perks: Since I use the shotty, I tend to use the grip on the shotgun while trying to get my headshots, along with Steady Aim to increase my accuracy while shooting from the hip. I use stun grenades in order to blind and slow people down so that I can get into range with the shotgun. And then since I am in close and my opponent is usually blind and stunned and moving slow as hell because of it, they can't get away from dying by my 3rd perk, if they get lucky enough to take me down..... I use martyrdom. It's not skill-less in my case. It's a very methodical and effective strategy to increase my killcounts per game. After I've gotten all my headshots and I'm just playing for fun at that point, I'll swap out the grip and steady aim for 3 stun grenades instead of just the 1, and add on the red dot sight. Very deadly. My highest kill streak of 20 has been repeated several times.
- Maps: What maps do you guys like? I wreak the most havoc on Overgrown, Downpour and Backlot. Have any of you seen the new maps they just released yet? Chinatown is decent and the others are good too I guess. I haven't downloaded them yet. I hear they're absolutely huge.