Depends on what you want really..Do you play SC2:Wings of Liberty at all?
Multiplayer is the only thing we can really comment on at the moment, as it's just 1v1 and 2v2 leagues that are available. I think it has a lot of potential with the new units, but a lot more thought needs to go into rebalancing before the game will be ready. We'll see how it goes in a few months, and how they approach rebalancing in both HotS and WoL.
Single player, I imagine it'll be the standard from Blizzard, really good fun

(hoping Diablo 3 was just a terrible terrible exception to the rule..). But there's nothing more we can say yet.