Good game but it has some "Mistakes" if you want to call it that way.
here are a few things:
-air units have a lot of graphical failures for example the Tau " Barracuda " in some terrains starts to fly vertically, or sometimes it shoots missiles without
turning to look it's target
-the game is not well balanced (some races are more powerful than others and some tactics don't have a counter tactic)
-don't you think the planets are too small ??? no really, Kronus in Dark Crusade was composed by 30 provinces at least, and here planets have 6-7 provinces
-when a unit dies sometimes the blood lies suspended in the air like a wall or something
-Dark eldar buildings have Horrible ground graphics when you see them closely
-the water have some graphical problems in a few maps
-the buildings you construct during a mission disappear when its finished
-the campaign map is too small, sometimes is difficult to see what is going on, it will be better if it was bigger whit a mobile camera
-some units lack of creativity (its the same unit of other races but whit some little details changed)
-some strongholds are too easy too defeat even in the hard difficulty level
well there are a few more things but im bored of writing this review XD
PD: this game don't make total justice to the Tau they must be better than this.