I've yet to find one I actually enjoyed my time on. I'm better off getting questions answered by just broadcasting in global chat in-game. The dorks and power-moderators of the channels for games are the same types of dweebs who used to lock forum posts asking questions with "lol search function n00b, LOCKED AND BANNED".
So far, the only Discord servers I'm on are leftists one. The vibe is good. But ya, the format isn't helpful for trying to get information.