I bought my xbox around 4 months ago (GOW3 Limited Edition Bundle), and it came with a Crysis 2 DLC code. I've tried to sell it via the Xbox Market forum, but no matter the effort - can't seem to do so. I've had mixed responses from people, some claiming its a great game and others the total opposite.
I'm considering just using it myself - is it any good?
I'd consider watching these videos if your on the fence about buying it.
For me, it was a game that I rented and I ended up really enjoying (gorgeous graphics, innovative/brang a couple of new things to the table and it was a nice change of pace from playing fifa/cod), but I did eventually get tired of it.
I'd suggest renting it for a week or two to get a feel for the game instead of buying it right away as there a couple of issues with the game (Hit registration, not a huge online community for the game, the lag can be a problem at times, ect..)