On the WotC Dark Sun forum I posted some of my complaints in a thread there.
That said, I am a long time Dark Sun fan who has done a good amount of fan authorship. There are themes in Dark Sun which I firmly believe shouldn't have been altered, but were done so in the issues.
To me it is water under the bridge, but I wanted to point something out. Some of the reasons for the changes were to make the published product fit the greater D&D rules better. I think this decision had to have been by someone who wasn't vested in Dark Sun as a fan of Dark Sun might have been. For instance, so many of the arguments for including, say, paladins and arcane bards into Dark Sun could be made for including them in Oriental Adventures. Afterall, they are in the D&D PHB, and with mental gymnastics anyone could imagine them fitting into an Oriental Adventures game. A further example, why create some new fangled divine classes (shugenja, shaman) for OA, surely the D&D clerics and druids could substitute just fine.
How much of the PHB classes were ditched for Oriental Adventures so as to fine-tune the "feel", compared to these Dark Sun issues.
Fact is, Oriental Adventures is proof enough that the entire collection of standard D&D classes don't work for
certain specialized settings. Dark Sun was specialized enough for a 3.5 conversion/update of it to warrant appropriate treatment, like OA was/is given.
In the end, I believe the accelerated publishing cycle (authoring and editing) of the magazine world is the number one culprit with the preceived "flaws" with Paizo's Dark Sun revival. I firmly believe that of the retired settings, Dark Sun was nearly unique in the vast number of alterations from the base D&D races, classes and other rules. Were Paizo to decide to try another "retired world" revival, I don't think there is nearly the number of landmines they'd potentially set off.

So I hope Paizo isn't discouraged from reviving other "retired" worlds!
I'd LOVE to see a complete Savage Coast revival, hire Frank Brunner for that job today!
Regards,
Eric Anondson