Microsoft has every other consumer OS hits going back to Windows 97 - ME flop, XP hit (2000 was generally considered a server OS, the follow up to NT), Vista flop, 7 hit, 8 flop, 9... hit?
I expect they'll fix the desktop experience in 9.
Oh wait, you said disappointment - yeah, usually that happens too
For me it usually is WHY THE HELL DO YOU NOT HAVE A MODERN FILE SYSTEM!? NTFS is way long in the tooth and barely supports metadata, much less user metadata. I like to tag things so I can find them later.