I'm a jungle main. As any jungle main on the boards will tell you, we get abused more than any other position/role in the game, period. Doesn't matter how well you play for most part, or how poorly your teammates play, you WILL get blamed/flamed.
Top lane feeding because they're outmatched or overextended repeatedly? You didn't gank enough.
Bot lane getting ganked by the hyper mobile midlane Talon? You should be camping bot.
Midlane absolutely shit on because he picked a Syndra into a Yasuo? That Yasuo got 6 ganks. I got 0. It's the jungler's fault.
These people bitch and moan because they either have never played jungle, or it's been so long that they have forgotten just how many responsibilities that junglers have. 3 lanes to assist when possible, 6 jungle camps with 2 pretty effective buffs to protect. 2 rift scuttlers that provide free vision. A dragon that gives team buffs every 6 min and WILL be contested. Rift Herald. Baron. Ganks. Counterganks.
To put it in perspective - outside of support which has a similar type of responsibility - the laners need to worry about trades and CS. Avoiding the occasional gank perhaps. Trying to push to get their tower. That's it.
Regular laners have no clue how difficult jungling can be, especially if you have more than 1 lane that is losing.