Ok, now I get technical............
Reason why it was ok:
1. The stereotypical Mac user doesn't know that their newest OS (OS X) is in fact BSD LINUX with a nice MAC GUI. They have no ides what power lies behind it.
Reasons why it wasn't great:
1. Windows has always had and will ever have bad memory management karma (invalid page faults, general protection errors..blue sceens)
2. Windows XP inherits all of 2000's bugs and security breaches.(Time for Windows Update every 1 day or risk being hacked).
3. Too much background noise.
Ultimate reason for low score:
(You guessed it..) Dude.......it's a clock!!!!!
Oh and yeah.....LINUX and UNIX RULE OVER ALL!!!!!!!!!