People want a multiplayer ARPG experience like diablo 2. They want to trade with thousands of other players, they want to get their characters to max level and loot whore. They want to PVP. You say the formula is old and being duplicated everywhere, however I have only ever seen one (semi) successful result of the formula since D2 - Titan Quest. Compare this to the bajillions of successful FPS games. Titan Quest ultimately failed not because it was a bad game (In my opinion they fixed TONS of things wrong with diablo 2, respecs, dual classing, shared stash, non retarded skill system, etc), but because #1 the areas were static and #2 there was no online community similar to battle.net to keep the thing going. Titan Quest could have easily become the next D2 had they implemented some sort of battle.net community.