Agreed with Z.
Seriously. Some systems give no interesting decisions. Some lead to fiddly game play with running back to stashes and what not.
I have to admit I did like the orginal Diablo method of sort of tetris style fitting things in your inventory. Then it got tedious as hell and become just NOT FUN. I ended up filling up on crap, going back to town and selling it, then going back.
Some games fix this by having your pet run back for you...which was neat but hardly fixes the problem. The 'problem' being fiddly game play this is only marginally 'playing' and more like a chore you must complete in order to play.
World of Warcraft is chocked full of such things. But the social aspect of shared misery trying to complete the repetitive grinds are what make the game addicting, in part.