It's difficult to not be rude here, but comparing iCloud to MobileMe is rather pointless. To say the former doesn't offer the same facilities as the latter is quite frankly just silly. iCloud is FREE and MobileMe was a PAID FOR service and quite frankly most people seemed to complain about that with endless criticism over the slothful performance and lack of speed of iDisk. Now suddenly it's paradise lost. Come on, get real. IMO the stuff that's been lost from MobileMe is trivial. It's either not worth worrying about or you can get the same facility elsewhere. Dropbox seems popular for FILE syncing although I've never used it. I didn't realise it was free. Good for them. Stop moaning that iCloud cannot sync files and just use Dropbox. No point Apple trying to duplicate something anyone else can provide elsewhere. Makes more sense for Apple to concentrate on stuff that no-one else can do, hence iCloud.
Let's put one thing to bed right now. iCloud DOES sync Contacts, Calendars and Mail (although any IMAP account does that) and a few other things. It has done so simply and effortlessly since I set it up, ensuring my 2 Macs and 2 iOS devices are in sync. To say it doesn't do these things is inaccurate and misleading. A lie in fact.
It also provides a lot more functionality with regard to music. Again, something that cannot be done by others and certainly not previously available through MobileMe. So, something worthwhile for nothing that you couldn't even get previously by paying. What's not to like about that and as suggested elsewhere, it's almost bound to get better.
The biggest problem so far with iCloud has been the massive rush by everyone to get started immediately it was released AND downloading their large iOS 5 and OSX updates at the same time. No wonder this caused a few problems with Apple's servers, but it was only temporary and they now seem to be behaving themselves. To throw your rattle out of the pram already would be inadvisably premature.
If Apple was handing out cash on street corners, some people would find a way to moan about it.