Fun Game to Play with other people... if only they listen to you...
Sound - Its ok didnt notice anything that bad, a few funny comments between Elliot and Tyson.
Gameplay - Its fun but once you beat it theres nothing really else to do but collect all your guns... then after that nothing. If you play with another player prepare to yell at each other to call for cover, and revive you.
Replay Value - You'll probably play it at least 5 times before you give up on it.
By the way there is an Add-On Content (Free) with a few extra leves, not sure if it gives you anymore guns, but nothing to make it any better.
Overall - Its a fun game I'd recommend renting it first.