But it seems like many people just think it was pretty much the best thing ever and you cannot criticize any aspect of it whatsoever.
This is utterly false. If everyone loves these shows, I wouldn't have a chance to defend them or stand up for them. Why would I want people to not be critical? It would deprive me of making me have to think about the merits of what I'm watching. My goal isn't to get you to agree with me. If you've thought out your position and I've thought out mine, we should be able to debate with each other to the point of a stalemate. Yes, I did just paraphrase Spock from "Court Martial". But anyway...
If you don't like a show, I've said that you should stop watching it. But that's not the same thing as not being critical. You can like a show and still be critical of it. You can be "on the fence" about a show and still be critical of it. You can be "in the middle" and still be critical of it.
Anyway, if I go into the TNG or VOY or ENT Forum and start tearing those shows apart, I'd expect pushback. I'd be surprised if I
didn't get it. I'd be thinking, "What's wrong? Why aren't you standing up for your series?" If you go into a series forum and post a negative opinion, you're going have a ton of people disagreeing with you because that's the way forums are by design. The majority of posters in a show's forum will like that show. And it's going to be even worse if you make it look like you think everything's wrong with it and they can't do anything right. That's just the way it is. Anywhere.
EDIT: Hell, I even
encouraged a poster once to just own the fact that they don't like DSC and not to hide behind some forced rationale to justify it.
I could count on one hand the number of posters who I think are
genuinely problematic. And it might not look like it sometimes, but I don't consider someone having a different opinion than mine as being "problematic". If I have an issue with someone, there's always more to it than meets the eye and something else is going on.