I use my Watch for fitness everyday; and it's been on my wrist 12 hours a day for almost two years.
However, there's a huge difference between a watch that is targeted for serious runners/cyclists/etc and targeting a much broader market people who are looking for more than a fitness watch, which is what Apple is doing.
If Apple were to restrict their market to only people who were seriously into fitness, they would sell far fewer Watches.
If one is an elite runner or cyclist there are better watch choices - as you pointed out earlier. Fortunately, Apple has designed their Watch for a much broader range of the population - people with iPhones. That's where the money is.
It's a great smart watch, I'm not just saying that! Before the Apple Watch I never wore a watch at all I just didn't like them at all, now with the Apple Watch I can track my runs, see how many calories I've burned, distance I've run and so on, I can also get notifications from my iPhone, txt messages and so on, It's also stylish, I can change the many bands I have on a daily basis (something you can't do with most other watches) so yea I would agree with you it's made for the more mainstream and we love it