Gamespot got the full hands-on preview of Starcraft: Ghost during BlizzCon’s showcase.  This preview will give fans what they need to understand the Multiplayer concept and the purpose of each Terran and Zerg unit:

“The infantry soldier seems to be as weak as a kitten; his assault rifle doesn’t seem terribly damaging, nor can this character take much damage before he falls over and dies. However, infantry can build stationary turrets that, when placed well, can be highly effective defenses (as well as offensive weapons, when built near enemy spawn points, which is similar to the old real-time strategy tactic of “towering”—building a defensive tower in enemy territory to take advantage of its defensive fire capabilities).”