iCloud offers most of what MobileMe did. And some stuff it didn't. For $99 less. In other words, for free.
iDisk can at least partially be replaced by Documents in the Cloud (a part of iCloud) or a separate app like Dropbox (see signature).
Galleries are more than replaced by iCloud Journals.
iWeb? Although I enjoyed it, frankly, it was only used by total amateurs. Try Coda 2 and its companion, Diet Coda. Or Weebly. Or any other website making and/or publishing service.
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No. iCloud is one of the greatest incentives to upgrade to Lion or Mountain Lion.
Sorry, bro.
Edit: cvaldes beat me to it.
You are wrong.. I Cloud does NOT offer what MobileMe did... you obviously didn't use MobileMe.