I've only been here in the last month or two, but I really like it. The Discord has maybe ~150 members, but a lot of them seem to be members from all sorts of times. Servers will have between 1-10 players on them, but more are always possible. The host does it from his own machine, and so uptime is always pretty great. If you have an issue, then the community is both small enough for your problem to be heard, yet large and established enough to actually get a good response.
If you want a particular pack, you could either suggest it as a voting option in the biweekly odd vote on packs to implement, or even offer to set it up and run it yourself. Currently running is Revelations, SevTech and now, Eternal. There are some very long term (and competent) players, and some people who are new to the packs.
It has a large range of whatever you might need, and the experience has been nothing but positive since I've joined. No real drama has been seen, the chat is chill and mostly just focused on minecraft. It is, at its core, a solid community of people who like the game. If you like a stable place, this is a good one.
While I've only been here a short period of time, I think I've found the server where I will happily play minecraft from now on.