Why Jungling is "Hard"
Jungling is an important, if not the most important, role in a League of Legends match. Now I am not in any way, shape, or form a highly skilled player, but I enjoy jungling with a lot of passion finding it interesting while keeping my awareness of everything going on in the game. Keeping an eye on lanes to make sure they don't get in a sticky situation or keeping vision on the enemy jungler to enable a counter gank or make a move on an objective is the premise of the role. Either to get a lead or improve a lead for your teammates and objective control is what I feel is the whole idea of junglers as a whole.
Now, whenever I jungle in a losing game because my teammates ignore the careful pings for being pushed up with no vision and then get ganked resulting in their death, it is easy to blame the jungler for not helping you for being out of position that could easily be avoided by playing safe or putting down wards. The jungler, if in the area, can counter gank, hopfully resulting in a complete turn and killing the enemies involved or it could get all your allies killed. Either way, the jungler was there to help right? Wrong, if all the allies die when trying to counter gank, the allies blame the jungler even though he didn't even have to help because the allies were out of position in the first place.
The jungler is there as a tool and if he sees a opportunity to get you ahead, the jungler will try but needs the follow up. Another reason people flame the jungler is because of "stupid" plays he/she will try to do. Now, although they seem stupid depending on the play, there is a high percentage that if you or any other ally got involved, it could create a lead for the team. But if the jungler just runs in there without warning or when you or an ally are no where near, then yes it is a stupid play.
Junglers need assists/kills/farm to stay in the game and it is hard if they get counter jungled from the very start with no help from the allies. Allies who do not ping mia's or who are in position to help the ally jungler being counter jungled but doesn't is a very frustrating and tilting event for junglers who then will power farm to make up for lost creeps and then will get flamed for not ganking. Events that could be prevented from allies simply warding or following their laner could prevent these events from happening thus resulting in more ganks and not a tilted power farming jungler.
In conclusion, jungling is hard role in the premise that people have expectations that do not fit your role and will flame you for not being a Meteos or Svenskeren type player. It is very discouraging to new players who want to play/learn jungle yet get flamed for being bad which then makes them never want to jungle again. Again, I am no where near a good player but the above is what I face every game even when I am not jungling, I tend to blame them even for my own mistakes that could be avoided. All I ask of the community is to understand that junglers are there to help, not to fix your avoidable mistakes.
Thank you for reading my rant, have a nice day :)
TL;DR: Jungling is hard and discouraging because allies always blame them for everything, even though it was clearly everyone else's fault.