Season 8 was the worst jungling year for anybody that didn't play Graves
Jungle needs a lot of changes right now. Junglers are always behind in experience in lower ELO, even though RITO is claiming this is the opposite in higher ELO. Once they go through with nerfing experience, every lower ELO game is going to be a joke where junglers are 2-3 levels behind everybody else. I'm a gold 5 jungler and I can't remember a time where I've been higher level than anybody on my team this year.
Jungle diversity stinks. If you don't play Graves, Lee, Kha or Xin you are going to get choked out of succeeding early.
Krugs is still a miserable camp to deal with. It's preferable to skip them right now because of their location and the time commitment they take.
The meta is forcing junglers into interacting heavy into lanes, mostly for LCS ratings. This is causing a lot of frustration for laners because they feel like they are being camped too often, which they are because actually farming jungle is not worthwhile.
Update: Free Sejuani in 2019!

(low elo)
(competitive)