Depends on what you are gonna do, get on top and snipe or stay down and pwn!
Watch my video, and try the SMG or Sniper class... the M16 is good too but the SMG is more of a stealth class if you use the silencer and it's essential in such a small map and also good for search and destroy!
*feel free to comment and share the video
[ame="
https://www.youtube.com/watch?v=tkRpL06Cd1Q"]YouTube- Modern Warfare 2: Custom Classes[/ame]