It's always been that way. The only difference between now and "back in the day" is the internet, whereas it used to be confined mostly to local clubs and conventions. Criticizing and nitpicking Trek has been going on since day one, it's just that now, more people can see it and there's more to critique and nitpick with every new production.except for the fact that Trekfans can be hyper critical.
That is one of the best points made in years really, and we all now it but have never wanted to admit it. I mean, a bad episode is just that really, but fans have this way of going critical-mass when their high doesn't deliver. Perhaps I'm a minority, but if I don't an episode or movie, I just move on and watch what I did like.
But the majority of people who like Trek are silent, IMO, but they speak with their viewership or box office tickets.