Recently, Diablo 3 and Path of Exile.
The "grindy" nature of these games ended up not being quite what I'd envisioned. I'd always said how much I hated the idea of grinding, but my idea of grinding came from JRPGs, where you very slowly punch rats over and over and over again to gain EXP that you likely dont actually need. These though are different. Grinding (or usually called farming) for stuff tends to be super fast, and you can go back to the actual challenging areas/bosses/whatever whenever you want to try and really advance further. That's not to say the games dont have issues... like PoE's issue with combat VS elites being over WAY too fast (you either insta-win, or insta-die), but still, there's alot to like with both games. I've played D3 so far more than PoE since I'm stuck on a tiny island and my laptop is terrible, yet my usually-useless PS4 now has the console version of D3 on it. Though, that does have it's issues, some abilities are very hard to aim without a mouse. But still, both games are a blast to play, and I'm the sort of player that gets really into the min-max aspect of these, so that's really appealing. And then I still have Grim Dawn to try out. My only issue is that for both games, they do have their slow points, usually very specific areas that are just overly irritating to navigate. And PoE has that annoying focus on trading that I dont want to do.
And Minecraft MIGHT be another one. I remember waaayyyyyy back when that originally showed up on PC, long before actual release, I tried a very early version of it... Indev, I think, so it didnt even have infinite worlds yet.... and I wasnt really sure what the heck the point was. And then a bit later, back when chickens didnt exist and zombies dropped feathers, I got sucked in. Heck, I still remember when the Nether was introduced, and it was a horribly dangerous place where Ghasts spawned in huge numbers. And then I've been a HUGE fan ever since those versions. Heck, I've got tons of merchandise... big zombie & creeper plushies (they're huge, really), figures, foam sword/pick, various other things, and I play the game pretty frequenly, switching between a vanilla world and a modded world depending on my mood. And the game just gets better as they add new things. I have to play it with a controller though, despite that the PC version never really supported controllers.
And then that led me to Terraria, and well, pretty much the whole genre that spawned. Lotsa good stuff, but Minecraft remains the best to me. Pretty much my favorite game of all time, really.