What I see from being here daily for past 3-4 years:
1. Forum activity has decreased a lot. It flares up, like right now with the recent loot nerfs, but last 6 months has been very light compared to past years. General Forums does not get much activity now compared to other times. But the game population is down a lot - so it makes sense.
2. A handful of the same posters over and over again post and tend to dominate threads, by either derailing the thread by posting a contrary, thoughtless point of view and then arguing with everyone in the thread, or having a strong opinion (like being against any PvP improvements) and very strongly arguing against anyone who disagrees (thereby dominating the thread).
3. I feel right now there is really a lack of diversity of views in most threads - due to one or two dozen posters dominating the threads. I do see all the people who post occasionally and am really happy when I can read what they think. Probably just me, but I am less interested in reading the same poster say the same thing over and over (haha which I am very guilty of!).
4. I feel like SO many players who were really into the game have left - usually in disappointment or dismay - and so a lot of their enthusiasm and intelligent contributions are gone from the forums. Honestly, I feel like the forums are a shadow of their past selves - except for the great times when people who rarely post do in fact post.
5. There are tons of people who post with positive arguments/pro-Turbine views. They can dominate threads when people have complaints, and even troll the posters. This thread disgusts me (I agree with the OP and feel the responses had no compassion for the OP). Maybe the OP would not win a debate, and did not write too politely, but he is clearly young and IMO had some legitimate points (whether or not you agree with them, and he still deserves respect). People could have been nicer to the OP, IMO.
6. I think there is also a lot of cynical people and a lot of mistrust of Turbine and the forum moderators. Not everyone, but I think there are a lot of people reading the forums (and people who post a lot) who feel unhappy with the game and don't trust Turbine to do things well or the best for the players.
tl;dr
I think the forums have changed a lot. Lots of long time dedicated players/posters are gone; lots of new people here; not much life on the forums now except when Turbine does something major people want to comment on.
The game still has a great community - even on the forums.