You may not like what they do, and you may not buy it or appreciate it, but it's an insult to those at WotC who work on the game to say that their work is not valid or true because of your personal experience with the D&D product.
[EDIT] I don't mean to point this at anyone, these are just the words of someone who has written material himself, and I hope they don't offend.

Me me me me....pick me!
Sorry for being honest, but why should I care?
You sit around all day making games for a living and playing games for a living and expect sympathy for making something some don't like?
Get thicker skin if you cannot take the most severe of criticisms.
Game designers probably get paid more than most of the people that play their games do, so they should be able to take a little flak and understand that not everyone will like what they do.
Look at Scott Rouse. He doesn't write any part of the game, that I know of, but is out there defending it and WotC tooth and nail even within itself. HE doesn't yield what he believes in so why should those that disagree with a direction any company took with a product?
That is the risk every artist takes be it paintings, writing, etc that someone is not going to like what you did. So what?
Do it because you want to do it, not to impress others. If you do what you like, then why should anything someone else has to say be able to bother you?
That being said, why should anyone who doesn't like something done to something they liked in the past to alter it in such a way that makes them feel like their work as a consumer was discarded show any emotion towards those who made it including sympathy?
It is a two way street.
Like people can complain about not liking 3rd WotC can create 4th in the hopes of making some of them happy, and then those not liking for have every right to not like it.
Each side has their part to play in the whole scheme of things. WotC exercises its right with the direction of the product, and consumers exercise their right with their purchases and cheers/jeers of the product.
I think Super Chicken said it best: "You know the job was dangerous when you took it, Fred!"
PS: Not offended by it, just wondering why should the consumer care about anything other than the quality of the product they are buying? Did the author not get paid to do it?