Least favorite feature is the disc DRM and having to install the games in order for them to run. I've already maxed out my 250GB HD on the 360, and these games are just on DVDs not BDs. You'll be able to hold less games now, unless you're planning on upgrading to at least 1TB at minimum.
My favorite game of 2012 was Far Cry 3. It was like Skyrim, only better, since it had a lush, jungle environment filled with a lot of animals. Plenty of color and character in this game, and there was a lot to do from hunting and skinning animals to picking up herbs for crafting. The best parts...
Entering for XBLA NA
Wasn't too impressed with Shadows of the Damned, especially how the difficulty achievements didn't stack and you couldn't skip cutscenes, but Lollipop Chainsaw score attack style was very fun, as well as unlocking all the costumes, so that would be my favorite so far.
I want to build up my Marketplace feedback, so if anyone is interested in buying a code through PayPal for the cost of the drink $2.50, send me a message.