Kind of working with a skewed sample though. The people still playing right now during a content drought would, in fact, be the people who are satisfied enough with it or can make their own fun out of it. There are people who play this game just to party and dance at RP venues on the weekends. There are some people who subscribe just to play gimmick characters and do shout chat, and I've seen these people standing around towns for years and I'm sure they'll be standing around towns for years to come. That doesn't mean the game doesn't have issues or lack content and features in certain areas.
Most everybody I know no longer plays the game or enjoys it. The ones I know of that are still subscribed are just in it for the housing. I personally saw my interest in the game steadily wane throughout the entirety of Shadowbringer and Endwalker was just the nail in the coffin. I logged in for the free weekend since I still had the game installed and there was really nothing I felt interested in doing. The things that interested me from the Endwalker announcement were Island Sanctuary and whatever the next deep dungeon in, but neither of those things are out. There is no meaningful small group content in this game, and when people point out a lack of things to do they're just given a trite, "Go do savage."
As for the forums, they don't seem particularly worse or more negative than any other MMO's official forums. I think people tend to take criticisms, constructive or otherwise, to official forums because they have a sense that those criticisms will actually be seen and taken in by the developers. XIV's subreddit is notoriously positive from what I've heard, and so it's also pretty useless unless you're only wanting to see fan art and low effort memes.
It's probably a good sign that there are people that still care enough to post criticism and feedback on these forums. I think given a long enough timeline, the only people left on official forums are the diehards who will take whatever comes with a game. I took a look at GW2's forums not too long ago and it was very different from how I remember it being in its first 2-3 years. The attitude that I saw there was mostly, "It's too much work. The devs will never do it. It's a waste of resources to add a new race." etc. Sound familiar?