I completely agree, i think Diablo 3 should have more of an rpg feel. I also like the idea where you can pick up things like candles and maybe you can find secrets. Secrets would be pretty cool, ya know a secret item or two or a secret quest. That would be the shiz-nit.
How long would it stay secret with thousands of players playing?
There should definitly be more things to do. But diablo has always been a hack and slash rpg if it tries too hard to be something else i dont think it will be good.