I'd agree with the list, but I'd make #1 ACHIEVEMENTS!!
The concept of Achievements is huge, and really overlooked by non-360 players. It adds a lot of replay value to a game, gets you to perhaps explore games in new ways, and gives you the ability to compare how you are doing to a friend. Really adds a lot to the sense of community.
Note on the live file size limit: The file size limit only applies to Arcade titles. HD movies can be downloaded and they are often 5-6 GIG in size. The 360 also lets you start watching a movie download before it is finished. i.e. I just watched Transformers in HD (6 gig), and it was able to start playing within 5 minutes of clicking download. (The PS3 may do this too, I'm not sure)
Gamers have 3 choices this generation: The Exercise Machine, the Movie Machine, or the Game Machine. What kind of gamer are you?
