Personally, I have no use for the 4th edition rules at all, but that's just me. I stick with the 3.5 rules with some additions thrown in from Pathfinder. My real problem with the whole switch to 4th edition wasn't the actual rules change, I can ignore those after all. It was the rest of the things that went with it. The end of the print Dragon and Dungeon magazines, the termination of pretty much every liscense they had (Dragonlance, Codemoney's E-tools, removing all PDF's from Paizo, etc), that sort of thing. Add to that the false promises that their D&D Insider site was making... it didn't leave a good taste in my mouth. WoTC basically destroyed some of the greatest traditional treasures of the game system (the magazines) to make way for the online system that, after two years, still hasn't delivered everything they promised. Of course, it took WoTC many years just to implement a search function on their forums, so that's no surprise.
Basically, they made it as hard as possible to continue to play 3.5. WoTC could have at least allowed the continued sale of the 3.5 rulebooks in electronic form, if they didn't want to print any more physical copies. If they had been able to, I'm sure they would have ended the right to make any 3.5 edition products at all. Thank God for the OGL being irrevocable. As it is, they added a few things to the liscense for 4th edition to force publishers to choose between editions, rather than publish for both.
Basically, it felt like WoTC was going out of its way to alienate me. I went from a several thousand dollar a year customer to nothing, giving all my business to Paizo instead. I'm no longer a fan of the publisher of the official D&D, and that's a painful thing for an old grognard like me to say. I wish it were otherwise, I really do.