In mw2 Multiplayer there is no SBMM(skill based match making) like in the newer ones. Now this means there is mixed levels ranging from lvl 1 to 70. You might know if your newer that you constantly get your back absolutely blown out by sweats, or you will find modded lobbies. So here is a guide to help you out :)
Step one: If you are still in default classes use the Support LMG:(high ROF, accuracy, mag capacity, red dot sight, lower recoil.) Use this to get good kills.
Step two: Dont try instantly go to the intervention and try to be an MLG POGGER. You wont be that good at first, trust me bro.
Step Three: When you unlock create a class use: M4, Semtex grenade, PP2000, 2xStun Grenades:(perks: Slight of hand, and any others you want)
Step 4: When you get to level 12 use the Vector and keep using that until you unlock the attachment: Fire Rate. Then keep using it an dlevel it up.
Step 5: Once you get 30 kills with vector and fire rate you unlock AKIMBO: Pros(FAST AS ♥♥♥♥, lawnmower) Cons(horrible accuracy, reload time).
Step 6: Use Vector silenced, it helps with accuracy and your going to be unstoppable.
Step 7: When you unlock the p90 or ACR use those.
Step 8: try to use cover while moving place to place, theres usually people evrywhere.
And if you actually read this your a super skibidi sussy baka giga chad. Now your a certified POGGER, now son, try not to get your ass filled with cream, i mean lead. See yah.