Titanfall 2 is finally on Steam! It was added just yesterday, so lots of people jumping back into the one of the best FPS multiplayers!
If you don't know the game, it's because Titanfall 2 and its developers (Respawn Entertainment, also made Apex Legends) had hard time on Origin being sabotaged by EA, but just check out its reviews (96% on steam) - it is one of the most acclaimed FPS of all time. Oh, and it also has giant robots :D
Singleplayer campaign is also pretty good: CoD/Apex mechanics with level design inspired by Half-life 2/Portal.