So I am miraculously up to Level 9 (yeah me, LOL) now.
So far I have only had 1 game where I have made more Kills than Deaths and oddly enough that was on a a rain soaked map (can't recall which one) where I was perched in a tower with a sniper rifle.
Oddly enough guys kept wandering into my field of view and bang 1 by 1 I was able to take them out. Last guy found my spot so I moved elsewhere.
Ended up I think 8-2 for the match (there was only 6 of us in the game).
Favorite kill though was on the map with the power station. I was over in the warehouses and stuck my head out only to be picked off by a sniper from the roof of a building near the power station. This guy was getting people left and right. I respawn and sneak my way over w/o any incident. I go up into the building find and opening and tossed a grenade up there and bam he is toast. The guy starts screaming and cursing up a storm about who the hell snuck up on him, he was pissed but claimed it was a good kill. I just laughed to myself and walked away proud of that one LOL.
Anyway I still don't have too many perks choices yet but they are better than the standard ones. Primarily running around with an M4 with grenade launcher, sleight of hand (which I love), steady aim, and stopping power, semtex grenades, and the 45 for secondary weapon.
Overall it is a fun experience. I think I prefer Team DM vs anything else followed by Domination. Free for all is ok but not as much fun IMHO.
Greg
EDIT - One other thing why the hell is that EVERYONE and I mean EVERYONE seems to know where I am and kill me but I cannot find anyone myself. What I mean is I am running around looking to for folks and don't see anyone but these guys come right up and kill me (you knifers that are silent drive me nuts btw). Other times I may be hiding and reloading or looking around and the same thing happens - bang right up behind me and dead. Kinda frustrating.
Once again, forget kill : death ratios for now, just enjoy the game and learn the maps. The more you play the better you'll get. I have an XBL friend who started out with a 0.45 or so kill ratio...he's played a good bit and he's already close to 1.0. I have an IRL friend who I play with who started off at .7* and is now at almost 1.3. You're going to get better, you're going to find weapon combinations and such that work better for you, you'll learn the maps, you'll learn the gameplay mechanics, etc. Just keep at it!
The M4 is a great weapon. At lvl 9 you've also got the SCAR-H which I like alot. It shoots slower than the M4, has more recoil, and has a smaller magazine, but it does extra damage and carries it's max damage value for a longer distance (both very helpful), and has some of the best iron sights in the game. At a "close" range it's a 2 hit kill with stopping power compared to the M4's 3 hit kill, but once again the M4 fires a good bit faster. Both get the job done. I like it alot. The M4, SCAR-H, ACR, and MP5K are my favorite weapons.
For a side arm if you're having trouble doing damage with the pistol maybe try the SPAS-12 or AA-12 shotguns, the AA-12 is full auto and absolutely brutal up close.
As for bad guys knowing where you are more than UAV's or heartbeat sensors if you know the level you're going to know where people like to hide out and you seek those places. Trust me, just learning the maps will go a really long way towards helping you get better.