FWIW I'm going purely based on what others have told me about their issues. Let's see... I'm told that they:
Randomized minis.
Deleted the d20 Modern boards.
Have moderator power grabs of epic egotism.
Release Feh modules, except for those written by freelancers.
Released the GSL late, putting small businesses in danger and forcing their best 3PP content provider away from their edition.
The GSL is draconian and caused another 3PP flight.
Their website is alienating, borked, and green.
3.5 didn't fix the biggest problems of 3e, which raises the question of why they released it.
They promised to never make people pay for errata, then released the Rules Compendium.
Have a dragon boob fetish.
Cancelled Dungeon magazine. (I could care less about Dragon.)
Admitted to designing 3e classes to fail because they were inspired by Magic: the Gathering, without considering that the time and emotional commitment to a DnD character is vastly greater than that given to a deck of cards, however pretty.
On the plus side, they release many free modules, some of which are even useful. I've used one.
The OGL was a shining light of enlightened capitalism.
Third edition, for all its flaws, was a comprehensive system that gave me a lot of fun.
Fourth edition has boosted ad sales and page views on gaming web sites.
Online free rules is a great idea.
What did I vote? I'm not going to tell you, as that would only bias your response to reading the commentary.