I'm not entirely sure they've chosen the best usage cases to show in the adverts. Who would really hold their wrist up to their face whilst dancing to read lyrics, or play noughts and crosses when you have a 4"/4.7"/5.5" screen in your pocket and you're sat down in a relaxed environment?
I love my Apple Watch, I really do. But it seems like Apple is having an identity crisis with regards to what it is and what it does. It's not a phone replacement, and it never will be. What's it good for? Well, it's really great for quick glances at notifications, for deleting spam email really quickly, for asking Siri to convert things, for telling the time, for dictating short messages, for encouraging movement, for seeing the current temperature in seconds, for controlling music when your iPhone's in your blazer and you have a coat on, for setting timers, for paying with Apple Pay... the list goes on. The Apple Watch is really great at all of this stuff - not just great, but better than doing it on the iPhone.
Wearables are pretty new and most people still look at them with a mixture of intrigue, and almost a naivety. It doesn't help that these ads show things which are just, well, not great to do on the watch. At 0:16 on the last advert (Goals), it seems to not even register after she taps a button. I wouldn't buy one on the basis of that advertisement.
Changing watch faces, buying a latte with Apple Pay, setting a timer when you've got greasy fingers whilst cooking are, in some ways, fairly mundane activities and probably won't make very sexy adverts compared to ladies reading their wrist when dancing. But they're where the watch comes in to its own.
The watch isn't a flop as some melodramatic tech bloggers are trying to say. It's a very successful product in a category which is still in its infancy, but I think (personally), whilst these ads look very nice and are well made, don't convey why people should buy one. People bought the iPhone because it was stupidly easy to figure out why they needed one. The Watch isn't quite as clear, and I think Apple need to address that issue first and foremost.