I tend to agree. It actually seems borderline dishonest since you're not showing people what using the watch is actually like.
I haven't had a lot of luck showing off the watch. When I tried, the screen kept shutting off even though I was interacting with it, and then Siri completely stopped responding in the middle of dictation. Made me feel like kind of a fool to be honest.
So far I've found that explaining what it can do in quite an understated way seems to be a good approach. It is about allowing people to decide for themselves what value they think it brings without feeling that they are disagreeing with you. I approach it in quite an inquisitive way, explaining I'm open to seeing what use it can be, rather than going gung-ho full-on about how incredible it is.
Last night I went out with a few workmates to an opera (of all things), and throughout the night I naturally made use of various different features, which they witnessed. I used the maps to navigate to the opera on foot without looking at my watch. I had pre-agreed to check in with my wife after the show to see if she needed me to come home, so I simply sent her a digital touch question mark, and she replied with a tick, implying it is ok for me to stay out. We both knew what it meant and it was far easier than texting. I then used city mapper to work out a way home and get us to the tube. Throughout the evening various step goals were completed which my watch informed me about.
The guys I was with were quietly impressed. We had interesting conversations about the nature of a watch and the weighting between fashion and functionality and how the delivered value can vary from person to person, and I think they found it a really interesting experience to see how a smartwatch could function in daily life.
To me that is the best demo you can give - in impartial demonstration of real-world functionality without overly promoting it or trying to create any specific impression one way or another.
