Recs.
Updated
XCOM 2 is a turn-based tactics game with RPG elements. It's the sequel to XCOM: Enemy Unknown set in an alternate timeline where aliens won the war against humanity.
Read IGN review
Also available for Android in the Play Store
SpecsUpdate
Pros
Pro It's fun to manage your squad
One of the main aspects of XCOM 2 is preparing your squad for each mission. You need to consider the terrain, objective, and enemy types. Based on these you'll select the appropriate soldiers, weapons, and gadgets. A lot of the missions have some leeway, so you'll be able to form a squad that fits your playstyle. It can either be a group of stealthy rangers, running in with machetes to surprise the enemy. Or it can be a group sharpshooters, allowing you to systematically clear the area from afar with sniper rifles.
After each successful mission/kill your soldiers will earn experience. With enough experience you'll be able to promote them and earn learn new skills. You can also research new weapons and build them. A lot of it comes down to looting alien technology and reverse engineering it back at the base.
All these things add up and it's really exciting watching your soldiers grow into unstoppable killing machines.