I know a lot of the criticism from Android fans has nothing to do with the actual pros and cons of the watch but rather just any excuse to attack.
Nevertheless, I thought I might point out some things about this "ease of use" / need classes or manual stuff.
I submit that the only thing that would satisfy the critics would be if the Apple watch read your mind. This is because it is impossible to create a watch with any real power over a standard watch without having to tell people how to use it to some extent.
Heck, take an ordinary watch and pretend you never saw one before. Would you automatically know that you need to turn the crown to wind it? Would you automatically know you pull it part way out to change the time? We know that now, because at some point we were shown those things, but if it was a brand new product, some would never guess. Yet those watches are easy to use once you do know.
Likewise with the Apple Watch. While trial and error may lead to lots of discoveries, without reading something or asking someone, how many would naturally think of double clicking the button? They would probably do a normal press, but many would not double click. Or the digital crown. Without some info, how many would know about pressing it once or twice? They'd probably stumble across some capabilities by accident by turning it, but maybe not the pressing part.
Some, with knowledge of phones may think of trying various swipes, but how many would come across the force click?
Thing is this, at least with new product concepts. Something can be really easy to do, yet require some help to find all it can do. This becomes less of an issue with similar products in the future - just as the basic concept of the first iphone is copied by Apple and other companies so we know to at least try things we never would have thought of with the first one.