I don't know about you but, XBMC is one of the reason why Xbox kicked PS2 and GC. I use it all the time.
I voted limited file support.
1. The 360 is a powerful machine, so why don't MS take advantage of that. Give us XBMC, I want to play DivX/Xvid files++.
2. Internal HDD or HDD at all. You can download stuff from Xbox Live, but if you buy the Core version you don't have a hdd? Even the old Xbox had a hdd. Solution Core=20GB Premium=120GB.
3. Red Ring of Dead. I've haven't had so many problems, just an E74 error. I think MS may have rushed a bit. So don't try to deny it, just fix it. I think it's cheaper to fix the problems, make new 360s and give us new machines instead of reparing them. It's expensive to repair them.
4. Builtin HDMI. Nuff said
5. Built-in WiFi. Heck it costs probably 20$ extra manufacture. Small cost for something so important. Zune has bulit-in WiFi. It costs 120$ where I live
6. That brings me to another thing, overpriced accessories.
7. Cheaper HDD addon. And why don't get a Blueray version?
8. Webbrowser? Even my mobilphone from 2003 has it.
9. More support for USB devices.
10. Like my first concern. MS you got a powerful machine and Xbox Live. Take it to your full advantage. I want to see more apps to the 360.
Even so the 360 is one hell of a console. There hasn't been so many great games coming to a PC/console like this fall. Especially to 360. Despite the flaws I love my 360.