All sorts of people are into MOBAs these days but remember when DotA was just a custom Warcraft 3 map (which itself was based off of some custom StarCraft map?) I recall wandering into the Warcraft 3 lobby and playing a few DotA games, and it certainly was a fun diversion although I'm still kind of shocked that it would spawn a whole new genre.
I recall all types of fantastic custom Starcraft games, including Golem Madness (where you had one unit that you could upgrade into more powerful units), Hydra Ranchers (giant killfest), and Turret Defense (Tower Defense before Tower Defense was even really a thing.) People even figured out how to make RPGs. It was really impressive what people could make.
Anyone else remember playing some of these sorts of things?