Eh? The forums have been pretty consistent for their positivity/negativity for as long as I have been on them (original BC). And I have heard-tell (and have seen old screencaps from) original Vanilla that also show that.
There are ebbs, highs and lows that pop up, but even those tend to stay pretty much the same, maybe just different names. The kvetching about class, spec, dps, tanks, spells, rotations, etc etc. Or whenever a new game is coming out, you’ll see the waves of, “Is XYZ game going to be the WoW killer?”
Back during Vanilla, you had incidents like Tseric blowing a gasket on the forums because he got sick of the forum shenanigans. For reference:
WoW Wiki about Tseric
Or the posts about how “WoW is dead.” I can’t recall if the whole “Serenity Now” funeral pvp incident bled over into the realm forums or not, I think it did, but people lost their noodles over that one.
Back during the end of Cata into MoP I think, some of us were on here daily, trying to get a purely cosmetic treeant form for our druids, when they had gotten rid of resto druid shapeshift. That change came about, after much debating from people. I’d say that was a positive.
I remember someone back during WoD maybe, who was a new forum goer, who used to post, “How are you today?” threads Every Single Day it seemed lol. And the fun machinima threads people used to post were neat. There were also a lot of silly shenanigans in the pseudo rp threads that were just fun. That still kind of goes on today, though maybe not as much. And who can forget the TripleX pvp against pandas posts? lol
The forums are a mainstay, and they drift one way or another depending on any number of factors. The longer one stays, the more you see the patterns, imho.