Great co-op game with an OK single character game.
I played this game through twice on co-op and it just never gets old playing with a friend or sibling. You can each split up and take differnt routes to the objective and send out help to your friend across the street pinned down by enemy fire.
This game is obviously centered around team-based shooting. It's a fun little genre of its own but in single player it makes no sense. As when your medic goes down, you can just send out your squad leader or sniper to go get him and heal him in less that 10 seconds. This makes the game rarely hard, and only when your under intesne enemy fire does it make it hard to go get your fallen teammate.
A few misc. things I have found are the death animations are rather good and funny. When your on the mission with the bradely tank if you run and enemy over there is nothing left of him but a massive pool of blood. Also if you shoot someone with your support gunner's M60 his the enemy body flails around and falls. Also the explosions are fun to see if there is someone near the explosion because they go flying through the air like Superman.
Get this game for a good co-op game if you want it to last you 4 or 5 days.