You misspelled "awesome" in your title
I've played a bit of it. Sadly, the TVs I played it on weren't that great (standard TV and HD tv that was too dark and poorly calibrated), so it really didn't scream AMAZING GRAPHICS to me. Then again, I've only seen a bit of the game. Knowing how Unreal Engine 3 looks, though, I know it's a very good looking game.
I didn't get to test multiplayer, but I've heard it's great. Single player was solid, but I wasn't amazed by it. I guess I expected it to be more like a FPS in 3rd person view, but it wasn't like that. It wasn't bad by any means though.
I'd really like to play through the game. Maybe it will give me a reason to hang out with my friends, eh? From what I played though, it's overrated. I'd give it a 8.5-9, but not 9.5 like I've been seeing. Great game (so far), but not nearly as amazing has Halo was when I first played it.