I have almost every D&D 3E release, only passing on a few books that simply didn't seem of great interest to me (Ghostwalk, Draconomicon) or didn't work the way I desired (Book of Exalted Deeds). While the classbooks were uneven, they always seemed consistenly good (if flawed), and you could definitely see the evolution on WotC's part, as they figured out how to improve their product. Comparing Sword & Fist against a product released two years later would be silly, for example, as opposed to comparing against, say, Bastion's Arms and Armor.
Anything outside of the core requires my approval, and I try to hew as close to the core as possible. That said, while I am picky about what I pick up that's not from WotC, I do pick up and use non-WotC material. The books of Eldritch might are good reads, even if I don't use them any longer. All of the books from Bad Axe get my A++ rating, for example, and Fiery Dragon is almost always a winner.
However, I tend to steer away from some releases, as they just don't fit my particular design ethics, such as Mongoose's Quintessential series, or don't really float my boat, such as Freeport. Some materials, like Midnight, just rock on toast, even if I'm not sure if I'll ever use them.
But we've got an embarassement of riches, and I couldn't be happier, though I could be richer.
