Starcraft Universe is pretty awesome.
Currently the prologue is released, and it is excellent.
I'm mostly fond of the Firebat, and I haven't played any of the Protoss classes yet. Really solid skill shot that is fun to use, and a jetpack.
Medic is not at all what I expected, in a good way.
Ghost is bloody hard to play. Snipe has a very finicky range, and it is hard to maintain that range unless you are stealthed. Even then, tricky.
Marine is dirt simple to play. When bad guys are at range, grenades between shots. When bad guys are close up, spider mines between shots. When bad guys are far away but you expect them to get close very soon, Grenade first, then spider mine every chance you get.
The last boss of the prologue I spammed spider mines while waiting for him to show up, he was very not fond of having 12+ mines explode on him when he rushed me.