Presence of SOB and the DE is impressive and unique races. Sadly air units are worthless & poorly done.
The BAD SIDE & GOOD SIDE
The new races are almost the same gameplay and tactics as the other races just with the additional new resources and the effectivness against certain units.
The new air units are a good idea of included into the game but is just like a floating vehicle in the air and its way weaker and not deadly than any units. So much for air support.
New and unique models of the Sisters of Battle and Dark Eldar make the game more extra meat & corpse and colours into the game.
Longer campaign but weak strategy of conquering and defending and some races have certain power that could overcome certain races easily.
No proper inspiring conversation between different races and poor mission objectives.