Originally Posted by patteeu
Are Diablo 3 and Diablo 2 the same game? Are Skyrim and Morrowind or Oblivion the same game?
Independent of whether you pay for them or they come in patches, the changes from WoL to HotS dramatically changed the gameplay. It's not as big a difference as the change from SC:BW to SC2:WoL, but it's a pretty big difference. Not only are there new units, but many of the old units underwent fundamental attribute changes.
They aren't continuations like Mass Effect, but set in the same "universe."
Main difference between Diablo 2 and Diablo 3 is that Diablo 2 was awesome, and Diable 3 was an overrated piece of shit.