One thing that SC2 gets right which is endlessly frustrating when trying to play most other RTS games is how the units react to repeated similar commands: if you click a destination and then adjust that command slightly, the units don't miss a beat in their movement, and just adjust their course slightly (SC2 being the kind of game that it is, SC2 players will often just spam that command with only minor adjustments). In most other RTs games I've played, that second command will often recalculate the movement of the selected units sufficiently differently that it at least slows them down, and spam clicking will just cause them to derp out completely, making unit movement a frustrating task.

(To say nothing of Supcom's annoying habit of units setting off in the opposite direction. Especially irritating for your ACU when trying to beat a hasty retreat, which arguably shouldn't even have the vehicle movement mechanics which causes this)