Toss is a very flexible race...best race to use against random players, cause build order is basically the same for all 3 races... Units are the most powerful of any race, but are produced in less quantities. However, many people who play toss are attracted to them because of psi storm..indeed a wonderful spell...
I play only terran and i find toss is the hardest race to beat on LT. Therefore, i hate toss ...lol, but i'm not saying they suck, but they are a very powerful race if handled correctly....
All 3 races are well balanced, and can all kill each other if used good.... you can't say one race owns the other....and another race owns that...etc.... and there is NO race that is unstoppable...