I read a view Steam reviews, and the majority of the negative reviews seemed to whine that the game is too hard on "easy".
It is challenging enough on easy, I'm at the point in campaign where first marked ship shows up and I must say - I sweated here and there on missions, but never lost one. So normal is normal.
Though I admit, some missions in campaign are a random shitshow (the ones involving NPCs you dont control but cant die), but that is usual for such type on missions, didn't change in 25 years of gaming.
Still, waiting for 1st post-launch patch
EDIT: Also - the eldars in game ARE eldar corsairs.