Originally Posted by Douchemaster General
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.
The single player campaigns of StarCraft2 are a continuation of those in the original StarCraft in a way that is similar to the continuation of the story from Oblivion to Skyrim except that StarCraft continues the story with the same main characters. It's unlike Mass Effect in that there is no connection between actions in SC1 and consequences in SC2. There is a significant difference in gameplay though and (more importantly, IMO) in multiplayer.