The Best Game, The Best Addon and everything you need to make it all the better.
There are easily thousands of diffrent strategies in this game, because of the diffrent units, as an example, sending in some lurkers into the enemy base and burrowing them (they are invisible when burrowed) usually does wonders, but the enemy could easily have a Science vessel, observer or overlord to see the lurkers, and then send in some zealots, firebats or zerglings to take them all out.
This is the game that every RTS tries to be as good or better than, and there is nothing bad to say about it.