Rainbow Six Siege. They've really turned it around since launch. Still fairly buggy (Especially the fucking Fuze cluster physics), but the core gameplay is fantastic now, and I've been yearning for a slow, methodical MP shooter for fucking years. It's just refreshing to be playing a CQ shooter game where I'm slowly inching around corners, sending scout drones, looking for flanks, instead of running around bunny hopping like a lunatic.
Shame Ubisoft had to be the ones to make it though, because the microtransactions, while not up to Ubisoft's usual shenanigans, are still shitty. Post launch heroes are far, far more expensive than launch ones, despite in many cases not being good enough to justify it, since most top lists still rank the launch heroes (none of which can be bought with real money) as having the best gadgets and guns. I don't think I've seen a single BOPE soldier in any match for instance. Most people figure it's just because long time players have such a massive stockpile of XP to spend, and they want new players to focus on the more "standard" heroes, but it's still obnoxious.
I think a big key to the game feeling so good is the sound design, especially when you are on the defending team. Huddling in your fortified bunker room, while hearing bootsteps clambering up and down stairwells, and such, trying to pinpoint where the fuckers are, before hearing the distinctive sound of a Fuze charge or Thermite's breacher pads is nerve wracking.
One of the few games I own that has seen its concurrent playercount keep INCREASING, exponentially even, after launch, which should say something. Seems everytime they do a free weekend, the playercount that sticks around every week roughly doubles.
I've also started playing Twilight Struggle again. Fantastic PC client for a fantastic boardgame.