After playing the MP demo for 4-5 days (1-2 hours per), I have to wonder about the balance in the game. Not between Mercs and Spies, but between new players and experience players.
Learning the game is ridiculous. I've played SC1 and 2 SP (borrowed) but the multiplayer just sucks. After spending 1-2 minutes as a spy infiltrating the hospital, I get killed as soon as I try to do anything. I can sit above on 2nd floor and watch mercs run around, but once they're gone and I attempt anything, BLAMMO!
I can never tell if I'm making noise, or if I've set any alarms. As a merc, I can't tell *where* a spy trap gets set off (or even what they do). Whenever I neutralize something as a spy, I get killed before finishing, but whenever I'm a merc, a spy can finish neutralizing before I can get to him.
The limit of 4 players is pretty weak too. Glad I didn't spend $50 just to feel ripped off.