Terran have more "structured" tactics, but they take some time.
Zerg is Damage By Volume (DBV). Protoss I think is a mix of unit strength and structured attacks.
If you have an avid player, you can twart Terran attacks easily, due to the time it takes to mount a effective offense(i.e. siege tank conversion,spider mines[i know they never get used but], getting a ghost in the potential area, getting battlecruisers in range for Y cannon, on site bunker).