COD has alot missing in my opinion but that doesnt mean its shit?
Aye it gets soooooo god damn annoying and yes in 10 mins or so of playing you do scream at the telly.. but its a pretty good game
MW being the best, Black ops was a BIG disapointment
If u want more realistic get Battlefield bad company, you have destuctable envirments, vechiles xD and even bullet drop... Better than COD imo xd but thats me xD
If u want tips for COD open spoiler xD
My list of what works :)
Hardcore Base thingy xD
Scar - FMJ
USP - What ever u want
Semtex
Stuns
Stopping power
Sleight of hand
Steady aim
Scar has power to drop anyone on hardcore in 1 shot (bar Painkiller and Last stand) and when not on hardcore 2 or 3, Iron sights probaly the best in the game so you dont need sight xD and why would you waste that epic sound with a silencer? xD.
If that doesnt work
UMP - Silencer
USP - Silencer
Semtex
Stun
Sleight of hand
Cold blooded
Steady aim or ninja
UMP on hardcore beats pretty much anything, ive gone on 50 kill sprees without aid of camping or stupid killstreaks xD, Stick a silencer on it and all recoil goes on it as long as you keep to 3 shot bursts, which on hardcore is enough to kill anyone,that and the iron sight on it is actually really good, and especially good for med-long range counters, i have actually out sniped people with it :)