The single player campaign is pretty good. I played through it on Hardcore setting the first time through to get a good experience, I did. The campaign was stronger than Gears of War 2 and, to me, beat the original GOW. It drops you right into the action as soon as you pop in the disc. You get more of a back story with the main characters and get a real sense of them. The game looks a great deal "better" instead of dark colors you get actual color! The game puts a fresh twist on everything. New objectives, new weapons, new enemies, everything is better! The conclusion to this awesome trilogy is amazing and a twist you'll not see coming, I sure didn't!
The multi-player is beast. Faster, better, and you shouldn't get screwed on lag with dedicated servers this time around. Horde mode is completely revamped and worth the change! New game types to boot and just a good sense of "fun" when you chainsaw that baddie who wasn't watching their six...if you'll excuse me...I'm off to pwn noobs on some Gears.. ;)