Raith5
Adventurer
Personally I think that the "traditional core" of D&D is simply outdated. Lets be hones, D&D began as hack and slash dungeon crawler and a lot of its traditional core values tie into that. But I think PnP players don't look for hack & slash games any more. Video games can do them a lot better. What PnP rpgs still can do is character and world interaction and an adapting story. Sadly 4E made it quite clear that those things take the backdrop by not even trying to present a believable world. Instead the world was just there to give the combat context (The magic item costs for example or the scaling environmental challenges by character level)
I think I agree with the first part - I am sure there are many who have good hack and slash adventures but I think computer games do this far quicker than an RPG. But I dont think that 4th ed was inherently roleplaying light. I am not sure that 4th ed magic item costs are any less believable that 3rd ed. Also I found the cosmopolgy of 4th to be really engaging. Issues like the primordials, dragonborn vs tieflings, demons vs devils, the raven queen have been key drivers of the story of my high fantasy campaign. So I think the claim that the world just gives the combat context in 4th is a pretty big claim to make.
The underlying point here is whether you want to play hack a slash or high fantasy - D&D must be able to cover these.