Ooh man, for me, it was Battlefield 4. Something like 700 hours or so logged onto that until the game just fazed out and people moved on from it to Battlefield 1 or 5. But it was sooo, so good and so much insane fun. And all the expansions were pretty good and offered lots of unique and fun experiences. It was like a non-stop action movie and every game and map was insanely intense and exciting with a LOT of "holy crap" moments. And I had gotten darn good at it too, very often being at the top of my team in terms of score and KDR. Last time I checked, there were barely any servers running and then I got forever locked out of my Origin account because I tried to reset the password but then got no password reset email, leaving it in limbo forever more. Still, many good memories and exciting experiences with that game. I hope something else comes along that gives that kind of action-packed satisfaction someday.

I tried Battlefield 1 and 5 and eh, they weren't nearly as good (BF1 I had only tried the Beta, but it ran really poorly on my computer (before getting a new graphics card) so I ended up never buying the full game). For BF5, the maps just felt generic and there wasn't anything really unique about them while hit detection just felt weird and didn't seem to be as smooth as BF4 had it. I found pretty much all the guns to be clunky and unlikable as well. Not sure how many people still talk about it, but I don't hear anything about BF5 these days, so I'm guessing everyone has moved on from that, too.