I've heard good things about Paizo's efforts. People seem to have high praise for Rise of the Runelords for example. But I've not run them.
But I'd also say that just because everyone is probably doing a poor job, doesn't mean WotC could be doing a better job

- they are the 800lb gorilla in the RPG space after all.
I guess I don't understand why the state of the art hasn't gotten better after all these years. At least I don't understand why obviously useful information for DMs is not included (like encounter difficulty expectations etc - which I believe is an aspect of Paizo's offerings?).