The sentry gun gets you the kills at the beginning of the match, but you must time it right. The self-piloted helicopter is amazing. You get 4x kill easily self-piloting than when sending out a heli drone. You literally get a kill added to your streak every 1-2 seconds. Be sure to sit in a safe area though, or you will be dead when you come back from piloting. Get easy points from team deathmatch or groundwar. I like using machine guns to maximize killings. Snipers are for killstreaks. I'm a good sniper too. If you have a PS3, give me ur user! Well... I dont want to give away too much. I'll leave you with this.
You get several titles you can unlock. There are hundreds. The game is worth it, trust me. BUY IT NOW IF YOU DONT HAVE IT!!! This has been a 3 part review by SoulSilver. Thx for reading! Bye!