I think the best part of this new version, is the return to the old tactical pillar of old com: explosions.
Turret with 3 armor on a building? Don't try to kill the turret! Kill the building! Blow up everything under the turret and it instantly dies.
Complicated extraction/bomb placement past several fortified positions? Blow a hole in the undefended side and walk right through!
Extraction far away and on top of a building? Blow up the access to the extraction site, or just the whole thing and the game will assign you a new one, which at least in my experience, tends to be much more convenient.
That and psychics: god are psychics good. Put biggest thing in stasis, kill everything else. Put the only vulnerable member of the group/ threatened civilian in stasis and mind control whatever is threatening. Void storm to trigger 5 different effects on 5 different enemies.
The only thing I cannot understand is what prompted them to nerf Snipers so (especially if Assaults got such an unnecessary buff)... Killzone is the only good ability in the whole class, they are just never up to what one expects from snipers after xcom 2.
The only thing that breaks the game good and true are mimic bombs. For whatever reason a mimic bomb completely overrides the AI: no matter what is happening, every alien in sight will try to shoot the mimic clone, ignoring all other targets until it is dead, leaving cover to get to it, etc. It is a virtual I win button, although you can only make one per 1-2 retaliation missions.