Hi,
do not know if this is the first review of the game: http://www.4players.de/4players.php/dispbericht/Allgemein/Test/30527/80510/0/Xenonauts.html (in German)
It got 78%...I think it is pretty fair...it acknowledges that it is a true successor of the original one and that the groundcombat would be very good. Negative issues are that the AI of civilians and local forces (too random) is weak and for example the cover system (not transparent). The review would like to see more additional content to the original game but maybe the reviewer has not recognized the subtle changes.
So, maybe the Devs can improve some issues here in future patches, especially make the cover system more transparent and make the friendly AI a little better?