That's a simple question for me... Compared to Galleries it is a joke...
I have 3 macs, an iPad and an iPhone. My wife has an air and an iPad. I simply DO NOT need photos synced in that many locations... Why would I?
The four things I want to do with my photos are:
1) Back them up.
2) ORGANISE THEM INTO ALBUMS - ONLINE!!!!
3) View them on all of my devices including my apple TV (or print them).
4) Easily share them with other family members in other places and allow them to download and / or contribute photos to family albums...
MOBILEME Galleries gave me all of that... What the hell else would you or could you want to do with photos??? Galleries wasn't broke and didn't need fixed...
In fact, MobileMe was working flawlessly for me (in my business and personally). Then apple announced iCloud which simply robs functionality from MobileMe...
MobileMe made it easier to own multiple devices and have them work in harmony...
Losing: GALLERIES, iDisk, doc sync, keychain sync, mail sync (smart folder, signatures etc) and more. Was a stupid move that really ticks me off...
I guess in the scheme of life I will get over it because it isn't all that important to me... SO HAPPY NEW YEAR TO ALL OF YOU!!!