The only thing that this game has in common with XCOM games present and past is the title.
That aside, it is a tactical 3rd person shooter with mechanics that borrow from the Mass Effect series and Brothers in Arms games.
You are a part of a 3-man squad that fights against an alien invasion in the 60's America.
The game plays out with the player commanding 2 NPCs into cover and issuing them orders, while the player usually flanks the enemy. The strategy of the battles is well designed, with cover systems utilized by both the team and the enemy.
Overall, a strong 7. It's a decent tactical shooter but I think attaching the XCOM name to it created higher expectations with the reviewers. Forget about XCOM and you will have fun.