It's kinda not fair to determine the quality of an os by the number of service packs it gets. I mean nt4 wasn't bad - and it got 6 of them! also 2000 got 4 ...
From the release notes "Adds support for exFAT, a file system that supports larger overall capacity and the larger files that are used in Flash memory storage and consumer devices". Wonder if that would help with some of the SSD writes issues that Vista sometimes exhibits.
I think exFAT is more for MP3 players/Media players...you would still use NTFS for SSD drives.
That said, does anyone know of any media players that use exFAT or if Microsoft has re-enabled formatting FAT32 above 32GB for USB/External drives (it's annoying having to use Linux or a third party formatter to do something simply because Microsoft chose to block it and try to force exFAT on everyone).