From what I understand 4e barely qualifies as an RPG. It comes close to being a tactical combat simulator. Going 4e isn't going for lots of combat- it's going for all the combat. Mahap I am a neonate, but no combattier system occurs to me.
4e took out all the roleplaying parts because it did not feel the need to adjudicate them. Want to roleplay a diplomatic encounter? Then roleplay it, why let dice get in the way? Why do you need someone to create a system for NPC attitudes? Just talk to the NPC and roleplay it instead of rolling dice against DC to move the NPC through tiers of friendliness. 4e only steps in when it feels like rules serve a purpose (combat).
In my opinion, 4e is more abstract than the other editions, because it leaves everything that doesn't have to do with balance out. It created a balanced skeleton for GMs and players to then dress up and re-skin however they want. "This class can stun at this level. How? It's up to you, here's some general flavor to start with. This other non-magic class can heal because HP is abstract and rallying you to your feet is just as legitimate. Or maybe it is magic, it's up to you."
It just was not what people expected from D&D and/or WotC did not present it correctly. 3.X is highly granular, so maybe that is what people were expecting going into the next edition.