There's some nice changes to the established formula, but the game drags on way too long for what it's worth, while the ending is rushed and boring.
A lot of the dialogue is cringe inducing, trying too hard to be witty or funny for the sake of it. Ironically, I felt a lot more attached to my XCOM soldiers than any of the set characters.
The setting's premise is interesting, but it ends up being quite shallow, I kind of hope this won't be regarded as canon for a regular XCOM sequel.