My beef is this - Read this web page:
http://www.apple.com/watch/health-and-fitness/
Apple clearly goes on and on about how this tracks your activity in the background without you needing to do any Workout app nonsense. If this is the case, I would expect it to record calories and exercise minutes pretty similar to when the Workout app is on. Now, since you get more frequent HR measurements with the workout app and it can tweak its algorithm based on the type of workout I don't expect them to be exact. But they should be close (maybe +/-20%ish). Or Apple shouldn't really advertise the way they do.
The entire point (to me) of a step/calorie/activity tracker is so that I can reliably compare one day to the next and motivate me to increase my numbers. But when the numbers are so random depending on how you use it, the numbers they give lose all credibility to me. I don't feel like I can trust them. I can go a whole day, including workouts and barely top 400 calories in passive mode. The next day, if I turn on workouts for only an hour while I'm working out, I'll get 1200 calories. How can you reliably compare 400 calories to 1200 calories when the activities that created these two numbers are very similar? It doesn't tell you anything of value about your actual activity level between the two days.
If this is really how it is supposed to work, I guess I don't get the point of it. The data is rather meaningless and not motivating to me at all since it doesn't correspond to actual activity, but rather when you remember to turn the workout app on or not and for how long.
There are also reports of people with the 1.0.0 software saying that there really isn't a difference between engaging the workout app or not. So it makes me think it is possible for the watch to somehow passively track your activity consistently.