I've been a fan of Grinding Gear Games for a long time now. I've been playing Path of Exile since Open Beta (January 2013), and have spent more than I care to admit supporting development of a game which is entirely free to play. And I do mean entirely free; none of the gameplay content will cost you a single cent, ever.
Did I mention that they just added six new acts to the story, and did away with the few-acts-repeating-with-bigger-damage-numbers structure that has been a feature of ARPGs since the original Diablo? PoE is now ten acts of story, which you play through once per character, before moving on to the end-game Atlas (i.e. lots of maps). Yes, there's a reason why David Brevik himself went to work for Grinding Gear Games, describing PoE as "push[ing] this genre to new heights" -- a genre that Brevik was instrumental in inventing, remember.
Excellent as PoE is, though, with its deep and engaging gameplay, and its industry-best ethical microtransaction model, the game has spent most of its existence in the shadow of Diablo 3. It didn't seem to matter when PoE was named as Gamespot's PC Game of the Year in 2013; the games media mostly didn't seem to notice that GGG had kept on improving the game, adding content at a rate that giants like Blizzard weren't even able to approach, let alone match. Fans of the game kept singing its praises, but sometimes it felt like we were preaching to the choir; the player base kept growing, but slowly, and the game never gained the kind of attention that PlayerUnknown's Battlegrounds has managed to garner while still in early access.
GGG never let any of that stop them, though. They had a vision, and a supportive, steadily growing fan base, and they just kept on innovating, adding to and polishing their game until it really was the best ARPG ever made. Maybe that's why it feels so satisfying to see Path of Exile, and Grinding Gear Games, finally receiving their due and proper: top tier placement on Twitch, nestled between perennial A-list games like Hearthstone and Overwatch, with only DOTA2, PUBG, and League of Legends really outdoing them... and, let's face it, DOTA2 and LoL are behemoths of Esports that consistently outdo everybody, while PUBG is currently approaching saturation levels of gaming media coverage.