Just works is the mantra many attributes to Apple and its products and services. For the most part, it is a very true statement. But because of the nature of its successes, when something does not just work as advertised, it gets amplified in the media - traditional and social.
First, it is important to state that with more than 1 billion devices in the wild still being used and who knows how many Macs there are, it's quite obvious that people are using Apple's products and services including, yes, iCloud and other cloud related services.
More at On Apple.