[XBOX360] Finally Got It

I got an Xbox360 last night. I don't yet have Halo 3(because I have to get another controller along with it.) I did, however, get Oblivion. I haven't played it much yet but it seemed pretty cool.

I also got Forza Motorsport or something and also Marvel Ultimate Alliance I think. Both of them were pretty cool, nothing too special about either of them though.

Now, my question is, what are the MUST HAVES of the Xbox360?

Currently, I plan to get Halo 3 and Gears of War. I didn't really see much of anything else that caught my eye, aside from some RPG looking game, but I can't remember the name of that one. Also, I saw Shadowrun, which looked like it could be very interesting, especially if it is in any way related to the SNES game called Shadowrun.

Keep in mind that I don't really like sports games and I don't really care for racing games. Racing games can be alright, but they really aren't all that spectacular to me. I might be tempted to buy a baseball game or a tennis/volleyball type game, but no basketball/football.