oh wait, hang on...i got some more pointers....
"believe it or not, but grenades are actually more important than ur guns! think about it, flash the guy, he cant see....no matter wat gun u got, he's dead already"
"stealth walk and pay attention to ambient noise, running footsteps is a telltale sign that some1 is coming...then look at radar! if there is no friendly dots there....ur close to an enemy! use that to ur advantage to ambush them"
"most guns are able to shoot bullets thru various things such as crates/ doors...remember that...ppl take cover behind those things, just pepper the crate/door...adding a frag grenade there might also get u that lucky kill ;)"