Got my first Xbox 360 recently. Here's what I've played so far:
Ninja Gaiden 2
Much better than Sigma 2, and also the main reason I got a 360. More enemies, more options, more strategy in general. I'm surprised at how fast enemies die or get delimbed in this compared to Sigma 2. I cleared Path of the Warrior and I'm itching to try Mentor, but I should take a break 'cause I've been playing these games too much lately.
Halo Anniversary
It's okay. I'm not really into these shooters, so I'm not sure if I'll finish that soon. The controls and the shooting feel pretty good, and aim assist/snap aim was practically made for newbies like me. But the design is really tedious and barebones, at least in the first three missions. Wandering aimlessly in empty fields/cliffs is a pain, but I still prefer that over a boring corridor maze... like the first level... >_>
Banjo-Kazooie Sorta HD
Only played a little bit, seems like a great update so far. The controls take some getting used to, 'cause I've played BK and BT countless times on the N64, but anything is better than the N64's slug stick in the long run. I also downloaded Banjo-Tooie. I hope there is less lag in Tooie.