I see the point, but I'm pretty muted to marketing and other nonsense. When I see a car advert, I don't expect the car to come with the women in the background, I don't expect to be able to drive it at the speeds driven, I don't expect it to look as clean, or as nice as it does in the video, after a short while.
I see video games in a similar way. The best way to experience them is to play them, for lack of that ability, watch other people play them. Ubisoft never demoed anything with a sticker saying 'actual PS4 footage', so it never surprises me when the game looks a little different than what they've shown. It's not like I'm only going to watch the trailer footage, so it really does not bother me. I always know what I'm buying when I buy it. If I ever felt genuinely deceived it might be different, but I don't think I've experienced that.
I've been disappointed in the past, but not deceived. I think you have to be almost intentionally oblivious to allow for that scenario to occur. Walking into purchases blindly, with only the publisher distributed add campaigns used as your 'research' on a product, is almost always going to lead to disappointment, and that's true for films, video games, electronics, cars, almost anything. However it's not as though they prevent you from conducting your own research, the beta was available for all to sign up to, there will be another open beta shortly, and there are a myriad of videos on youtube on each platform, serving to demonstrate its strengths and weaknesses.