I'm one of the people, who learned about the game via gronkh. I always have been a big fan of arena shooters starting with Unreal Tournament and Quake 3 Arena, while I never really got into games like Battlefield or Call of Duty.
But the last years didn't offer anything great in the arena shooter department. I mostly played UT3, but while its core gameplay is great, the game has many flaws like the menu, where you have to leave the current match in order to visit the server browser (lol). And Quake Live.... yeah, I don't want to pay for a premium account only to find empty premium servers, while I'm still not able to play my own custom maps. Also, I never really was a fan of Quake's simple weapons. And there was Warsow, but I didn't like that one at all.
So, here comes Xonotic. I really wonder how I could miss this game (and Nexius) for so long. It does a lot of things the right way, it's certainly not perfect yet, but at least it has none of the main issues of UT3 or Quake Live, so it seems like I will definitely keep an eye on this game. Good job!
Sadly, what it shares with UT3 are the empty servers. But hopefully this will change in the future and more people will become aware of it.