Each terran army has more variation to learn and control than every other race's armies in the game combined. Each unit has it's own, completely separate ability that must be used simultaneously with all the others in order for the army to be effective... stim, siege mode, mines, emp, and i'll even include scvs+building turrets. If one of these abilities is not correctly used in combo with the others, the army fails and gets ran over, leading to gg since terran army regenerates the slowest. A lot of the abilities are more defensive than offensive in nature, and are usually required to counter some monsterous z/p spell or unit.
The other races have abilities completely independent of the armies functionality, dark swarm being the exception in late game ZvT.
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