I honestly thought it was very enjoyable. It was a bit short(as most games are nowadays) but very fun. I'd like to hear some opinions on this SP and your favorite weapon class.

Mine was heavy assault because the machine gun was a beast and you still got all your other weapons. The pistol was way powrful. i got a guy from like 100ft away with it.

I felt cheated by this game. The campain was ok. I didnt like how the sniper rifle was limited to certain levels. Also whats with the .50 cal sniper rifle that takes 2 shots to kill. And the accuracy was crap. The multiplayer will make the game when the servers get fixed. I was very disappointed in the server quality.

I enjoyed the campaign a lot. I just was pissed off you couldn't use all the vehicles, and I wish there was an Instant Action mode...the thing is, i don't have live so i can't play online at the moment, i've tried hooking up the wireless ethernet router but it didn't work (i have wireless internet in my house too), so i sold that and i might be able to directly hook it up to my computer since it has a wireless card in it and my friends is set up like that and it works, but for now i don't have live so i only play single player.
Overall though, the single player was awesome, i just wanted vehicles.

And the machine gun was a beast in this game, you're right. I love heavy machine guns in games, i always play the heavy gunner in every game with a class, it was awesome in here

the heavy machine gun class was just like the assault class but you get a beatish gun and the pistol(you get it every time) which is just as good.

how quick did you complete it?

This game is ok
It is not the best but its pretty fun!