Disappointing. Still worth a play though. Rent it and play it with a friend.
A game based from the ground up on co-op strategy.
Working together with your partner to complete the objectives. With a vast array of cool and/or original ideas like weapon customization, co-op moves, the chance to play air guitar with your partner or kidney punch them, the Aggro metre, and a two hardened soldiers that talk trash to each other. They had a great idea, but ultimately failed to capitalize on the concept and what could have been, the co-op game everyone was waiting for.
All in all, it is still a reasonably ok game, but i'd suggest renting it before you decide to buy it. Definitely better playing with a friend though.