I guess Microsoft is nowhere near bad decisions as Sony and Nintendo!!!!! The other thread got pages and pages of post! I guess Microsoft Wins!!!! LoL!

XSN. They got their collective asses handed to them by the third party competition.

Yes, I couldn't agree more. 

They werent nice to Apple, they took Halo from them.

Uhh...huh.. You seem to forget something else. 

Making hardware,
RROD it's not over, it still talked about daily and will haunt them for years to come.
Lack if Identity, not just the xbox the the whole me too attitude of the company.
Zune.

What else?

A Lot! I think the worst thing they did was focus too much on the Kinect and not enough on the Hardcore Gamers, that made them what they are in this business.

The RROD issue - was very bad for them, and lost them a huge amount of money. Probably lost a few loyal xbox users as well.

No they bought Bungie as Apple were too cheap to invest in them.  Although you could class it as a mistake letting Bungie have their independence.