For twitch communities, Curse is very much on the radar, and they can get very large. Curse has full integration of various features streamers use, such as giveaways. No longer do you need to setup a whole bunch of stuff yourself, you can interact with your community in an official capacity outside of just the stream.

Discord is a cool program, and I applaud them for how far they've come, but there are gaps in functionality that have been refused implementation because 'not enough votes'. Basic things, such as being able to change font sizes, or have two columns of guilds, or actually turn off the 'blocked messages' pop-up that comes in when somebody that you've blocked talks in a chat you're in. (Yes, that's a thing).

When someone has to download a mod for your program to experience it better, you're doing it wrong.

Discord still lacks features even Ventrillo had, such as text channels per voice channel. You can't just send stuff to each other, you've gotta form another group, or use a public text channel in the guild. Thats the kind of problem Discord was made to solve, yet refuses.

And, as you said, Its not near Mumble quality, and due to the convenience of the program everybody just uses open mic. I can't join a community VC without it sounding like I just joined a group Skype call. With mumble, you had to look through the options and setup your mic, and a lot more people chose PTT.

For anyone interested in fool-proof PTT, just re-bind your caps-lock key to F14 (Scroll Lock), or some other special key on your keyboard if you have extra keys.

Effectively, Discord is just used for text channels, because the very thing they advertise, VOIP, is worse than the software its supposed to be better than. Give me Mumble any day for voice, and Discord for chat.