im doing the challenges right now and it seems so impossible to do because the AI's don't even help you at all they just hang back and shoot.

By chance are you doing the "be more objective" one? Cause if you are then the point of it is that your team doesn't so any objectives, only you can

If you're doing Be More Objective than that's what they're supposed to do, because you're supposed to be doing the objectives.

in any case this objective is soo impossible! their health is way too high and my gun is like a fricken water gun!

Gears, gears gears...why is this ringing in my head?

I was afraid the weapons might be too weak..sounds like I might have been right.

Weapons are not weak. If anything they kick all kinds of ass. (two shots with the Ritchie on anything smaller then a heavy, and unbuffed.) Maybe wait until you are a higher level to tackle the challenge? Some of the perks make ALL the difference.

Be cool, I saw many vids and some guns can tear enemy apart really fast

Guns aren't weak. Only had a few not go down really quickly. Heavies and buffed.... I like the feal of the guns. I think I prefer iron sights too.

Well, the game is already sitting in my mail box so theres not much I can do but get home tonight and try it. I think I'll some fun but over all, like my sig says...i never got too hyped over this game...so I'll take it as it comes.

But if its not fun...I got Portal 2 waiting as a back up.

I drop ppl no problem and have been playing for 12 hours now on the X360. Maybe you should try a different gun or aim better ?