Well, all units are special (for each race) and those Elves' and Orcs' units aren't really super units as you seam to view them. The Tree of War is basically a siege engine while the Troll/Ogre/Hill Giant is probably a support units meant to supplement the Orc and Goblin swarms as a heavy hitter.
The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based! *Jean-Luc Picard*