Recs.
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Rainbow Six Siege is an online tactical first-person shooter, featuring close quarters gunfights and environmental destruction. You play as either one of the counter-terrorist organizations (GIGN, SAS, GSG-9, Spetsnaz, FBI HRT) or the available terrorist groups.
SpecsUpdate
Pros
Pro Excellent slow-paced gameplay
Rainbow Six Siege is unlike most modern FPS games. Instead of a super fast, twitch-based gameplay, it focuses on a very slow, methodical, and tactical approach to combat. You'll carefully navigate a building, peeking around every corner, using gadgets to scout out rooms, rappelling on walls, and listening to every sound around you. It's less about just shooting first and more about finding the enemy while staying hidden yourself, which is a refreshing change in the over saturated competitive FPS genre.
Pro Great variety of playable classes
You can choose from 10 characters on each side (total of 20) to find the ones that suit your preference, or to explore new, unfamiliar aspects of the gameplay.
As an example, there is Sledge who uses a hammer to break through walls, Flash who can blind the enemy with flash bombs, and Frost who can set up traps to neutralize enemies.
Having such a wide variety of classes not only adds depth to the gameplay, but also keeps it interesting for a long time.