Whether you ultimately choose to play as Protoss, Terran, or Zerg, you simply must ask yourself one question:
"Why would I ever buy a Blizzard game again?"
Diablo 3 was a big let down but that doesn't mean Blizzard still can't make some great games. Starcraft 2 wasn't my personal favorite thing because I don't get into the weird high level meta game stuff but Diablo 3 it was not.
I certainly have hope for future Blizzard titles.
Playing: Dark Souls 2: Scholars of the First Sin Watching: Mr. Robot