So a think I don't like about War of the Chosen (the XCOM 2 Expansion) is that the new villains behave like... well, villains. They taunt you and bicker among themselves.
Which I think really diminishes them. Up until now, the aliens have been this mysterious threat whose motives are unknowable (well, until the end anyway) and that makes them so much more menacing.
(The new factions are cool though, but I've gone back to Vanilla XCOM 2 as a warmup. The extra options are kind of overwhelming.)