If you've played invasion on reach, Rush is kinda like that mode. And conquest is a fight for different control points (flags) around the map. The Gameplay is like Medal of Honor's, but on much larger maps and the environment and buildings are destructable.
For example, want to get into a house but the door's on the other side? If you have a grenade, chuck it towards the wall and make your own door. The buildings also collapse if enough of the walls are blown out. It is a squad-based, teamwork focused objective
game (other than squad deathmatch). I would highly recommend it
Definitely worth the buy, don't bother with Vietnam expansion though.
It's kind of like Homefront with much better graphics, sounds, and destructibility. Guy camping in a corner? No problem, just blow out the wall behind him with a rocket or grenade. You also don't "earn" vehicles or killstreaks. You always start out with
the vehicles in your spawn and you just have to be the first to grab it.