Particular things that bugged me: the sets of alliances made and broken in the Greyhawk wars;
Wars have a funny habit of causing alliances that die out shortly after or are shattered by treachery. To me, this makes the wars seem more real.
Iuz successfully impersonating a Suel god to take control of the various Barbarian kingdoms;
Iuz
is a god himself you know...
I seem to remember something in history about the Aztecs mistaking Cortez and his men for gods and that leading to their downfall and conquest by Spain. This isn't that far fetched.
the sudden and widespread success of the Scarlet Brotherhood in taking over kingdoms;
Sudden?
The
SB has always been explained as having its hands in the governments of many nations through spies, assassins and thieves. Taking advantage of the turmoil and seizing power doesn't strike me as too out of character for them. I was somewhat annoyed by the sudden appearance of massive
SB armies and naval fleets, but that problem is in the execution, not the idea.
the Circle of Eight's virtual annihilation; heck, the Circle of Eight-where did that come from? I don't even know ...
The circle of 8 is a fairly old GH idea, stemming from the original citadel of 5 (i think that's what it was called) power group from the original Gygax era campaign.
Rary goes traitor. Tenser dies and is ressurected. Otiluke dies. Jallarzi, Alhamazad and Theodain join the ranks. Virtual annihilation? I think you're overstating the events.
Greyhawk was the first published campaign world I ever used, because it was the first published campaign world.
If you want to get technical, that's incorrect

Empire of the Petal Throne/Tekumel was first.
If you don't like every detail of current GH, thats fine, as others have said, you can ignore what you feel doesn't fit. I do have to concur with the sentiment that this was a troll though, since it came off as the tired old 'old gh good! new gh bad!' mentality, and you didn't even point out any details of what you don't like.