Welcome to Xbox Live, where the grass is always greener (and pretty much everything else as you can see.)
For games I would recommend Crysis 2, it's a lot like halo in terms of (some) weapons, the graphics are amazing and it has a great single-player experience as well. If you're looking for Xbox exclusives there's Gears of War, Fable, Halo just to name some
of the bigger ones, there are tons of other things you can do with your Xbox as well. I hope you enjoy it here as much as I do.
Remember always log in to your windows live ID regularly and never wait 90 days between signing in.
I noticed! The only other system that I have had for this generation is a Nintendo Wii. And I will say this step up to Xbox 360 is amazing! The graphics are beautiful, the dashboard and avatar systems are 100 times cooler than the "Wii mii" thing haha.
Plus you can actually have a personal friends list to chat and game with. Which is cool, the only game that I had for Wii that supported multiplayer was Goldeneye. >.<
I will for sure check out the Crysis 2 game as well.