Psionic Warfare: Total Destruction is not your average Starcraft mod. Somehow, the people behind this mod managed to transform Starcraft 2 into an entirely different game.
This mod makes Starcraft into more of a third-person-shooter where you are put into an arena and forced to survive. There are five playable classes, four different game modes, and four different levels. It's extensive! You can play it with three other buddies, too. Bonus: you can get into Vikings, and upgrade them as well.
If this sounds cool to you, you can download the mod here. It'll be a good consolation for those of you that are still hung up on StarCraft: Ghost.