Should i buy this game just for the SP? Haven't played WoL after campaign not into MP.
If you played the Original Starcraft and loved the story line you should get it. If you havent and dont mind the older graphics get Starcraft and Brood War and play it right thru to get the back story of the Starcraft Universe.
I only play for the single player and its a awesome experience with both WoL and HoTS.
So if you like Strategy games with a awesome story line I would suggest grabbing this.