My impressions:
"sensors" are broken and/or stupid. Enemies firing on you in the frontal arc sometimes don't get put on the UI. inconsistant in effect of breaking LOS with enemy. Sometimes remain locked despite huge mountains or walls, other times break lock on a small wall remnant at 25m range.
Early missions while solo have too many enemies. Its not even difficulty, its just dumb running around killing dozens of trash enemy by yourself.
warcrime turrets...
are....
everywhere...
seriously, pop up turrets line the map everywhere. Why warcrime turrets? well they put them right next to civilian buildings, compounds that look like farms, actual farms, etc.
Last, why are the mechs nearly uncustomisable? MWO and Battletech both let you go pretty nuts in configuration, here... better like the stock configuration cause thats pretty much it unless you toss weapons out for more HS or armor.