I have been playing the hell out of Horde mode. Love it.

Beast Mode is an entertaining bit of fun as well, since it's different. I am still not the biggest fan of the MP as to me it's still a lot of shotgun ho'ing, and this game + shotguns = no love for me. The single player I've just gotten rolling in, it is impressive. As stated, the end of the third act is sad, I will go as far as to say it is a bit of a tear jerker.
To get my Baird code from Best Buy I had to go on their forums. The forum moderator sent me a code less than 12 hours later. Been using Mech Baird since. Strangely enough though, I received
this Monday from Best Buy a code for Mechanic Baird, as they advertised.
Gears to me has been all that hoped for. Definitely one of the game of the years.
The Battlefield 3 open beta started today, right now it is one map. It's definitely stunning looking. It's also still Battlefield, if you're not a fan of the game's play style, this won't change your opinion of it.