Challenging role, JG xp nerfs have been frustrating (being lvl 4 when solo lanes hit 6 on average), Almost forced to pick a JG that can viably start Full red side clear for lvl 3 from 3 camps, otherwise you'll be lvl 2 for scuttle fights, And partly due the the Jg xp nerfs and partially to the damage/burst meta, if you lanes do too badly in their 1v1's/2v2 you lose a ton of agency to impact the game since them being solidly ahead of their lane opponent (your ally) puts them most likely even further ahead of you than that since you are getting nerfed xp/gold from jg.
Previous seasons, if you Pathed well, killed camps as they spawned and ganked periodically you could be about 1 lvl under the solo laners on average, and if you were stomping the enemy jg and counter jungling etc you could be equal level to the solo lanes, now the only way to do that is taking a massive amount of lane farm/xp on top of your camps.
B/c of these changes and the meta, jungle skill/knowledge difference is exaggerated: For example say Im jungling against someone who doesnt know that the fastest lvl 3 is Red>krugs>raptors, I run into him at skuttle w/ lvl 3 and redbuff to his lvl 2 and blue, I kill him or force flash and then get free double skuttle and am now way ahead. (bonus is the added variable of which Jg's laners will look at minimap and help him in skirmishes). Anyway with how snowbally the game is if you get put behind as a jungler now that the role is weaker its much harder to make a difference.
And b/c of Jg being the main role that can affect the whole map, if you do get snowballed on, or see your lanes losing and try to farm up/pressure the enemy jg so they can't help their already winning lanes, either way you will likely get flamed.