Alphicans
Smash Hero
Back from hawaii! And to answer your question on the imbalance of 3v3, then answer is units. In 1v1 there is a finite amount of units one race can produce, which is 200 supply worth. In 3v3 there is 600 supply worth. Once you take this into consideration, I think it becomes pretty clear that terran would have a clear advantage if the team was 3 terrans. Not only are mass tanks a huge problem for every other race, but as Slayers_Boxer says, terran marines are probably the best unit in the game. They are to good; cheap, easy to get, strong in numbers, can attack both air and ground, good range, good mobility, economically friendly. I really don't think any other team combination other than another team of 3 terrans could beat 3 terrans, unless they seriously out skill the team.