Well actually I prefer a couple of weapons. The MP5 Navy and the ES C90 are both really good SMG's. The MP5 is a bit better for accuracy while the ES C90 is better for spraying around corners.
The CV-47 isn't my favorite gun
because of its lower accuracy (just my opinion) but does have higher fire power. Also I don't like the sound
The Maverick M4A1 Carbine is an excellent weapon, with its silencer increasing accuracy but reducing the power. I approve of this weapon (D902ls. Seal OF Approval). It is probably the best weapon you can use for long range, as for fight yard maps (FY) they aren't as useful as the CV-47. Also the Bullpup (a.k.a the AUG) is pretty good dude to its scope. Very little power though. The Krieg 552 is a little better than the Bullpup but costs quite a lot more, reducing your chances of getting a kevelar and helmet, grenades and a defusal kit. The Magnum Sniper Rifle (AWP), is also very handy with its quite common 1 kill shots. This weapon will bring lots of negative attention however. Krieg 550 Commando, the automatic sniper, auto as in no re-cocking neccesary. D3/AU-1 is the same.