M.L. Martin
Hero
I think Nitescreed defined the nuts & bolts of the setting best
By essentially arguing:
1) Forgotten Realms is bad.
2) Greyhawk is Not Forgotten Realms.
3) Therefore, Greyhawk is good.
?

There may be some good stuff in that article on what makes Greyhawk distinctive--I'm not familiar enough with it to say (and before anyone assumes biases, I'm not a Realms fan either)--but it's hard to make it through the sneering contempt for those who dare to prefer a badwrongfun setting.