Maybe because you have loads of members that have to act like a strategy game (X-Com etc.)
Equipment: Warcraft III has this, is it a RPG?
Character Stats; Warcraft III, Majesty, C&C Generals etc. have this; RPG?
Leveling; Warcraft III, Majesty, C&C Generals etc. have this; RPG?
Story; every game has a story behind it. Half-Life 2, Red Alert, Generals just to give a random amount...
Different "classes and builds" is like "units" in a RTS (Rocket, rifle, tank, plane etc.)
Commando's, like said, if you turn a game like Silent Storm into a Real-time version it would be like Commando's. May not have these specific RPG-parameters, but it does have the same type of strategy...