There seems to be some misconception about junglers now that used to exist for supports: this idea that a jungler has zero responsibility early-mid outside of feeding his laning allies. I understand (as a support main) the pressure this places on current junglers, and I appreciate those of you who take the time out to help the rest of us see that you have more to do than just gank and win lanes for your teammates. So since this misconception exists, let's take a look at what a jungler does do.
FARM
Yes, just like ADC and mid, junglers need gold to be effective, though possibly to a lesser extent depending on his role on the team (tank, dps, support). This means he needs to nom on some jungle creeps, hopefully sustaining himself somewhat towards mid game. Some junglers need more farm than others, so his other objectives may have to wait a bit before he becomes effective. This point needs to be observed and/or communicated very early on so that everyone understands why he has only ganked twice before 6:00. Others can clear a couple camps then better direct their attentions elsewhere, such as...
COUNTER-JUNGLING
The counter tactic to farming, stealing your opponents camps. You can also find duelists seeking out a fight with the enemy jungler in this capacity, particularly if sufficient vision is maintained [NOTE: supports, getting a ward on the enemy bot-side buff (blue buff if you are on blue side, red buff if you're on red side) early on helps tremendously]. Think of it like this: in lane, you can try to zone your opponent out of CS range, denying his ability to farm. Counter-jungling is a jungler's method of accomplishing this same feat. Sometimes it's better for a jungler to steal his opponents camps rather than try to counter-gank, and laners should be mindful of this, i.e. inform your jungler if you are being camped top so he can steal the bot-side buff.
BUFF MANAGEMENT
Let me get this out there: both buffs always belong to your jungler. Blue does not automatically belong to the mana-dependent mid/top, Red doesn't necessarily belong to the ADC mid game. These are his creeps, just like top lane minions belong to top and mid lane minions belong to mid. If he is pinging to share a buff, then communicate with him as soon as safely possible whether or not you want it and move when you can towards that camp. Don't expect to always receive the buff, and don't always expect to continue receiving buffs once you do get one. It is a jungler's responsibility to track both his own and his enemy's jungle buffs, and he should know when to try a buff steal vs. gank, counter-jungle, or farm.
GANK
Sure, ganks are a part of what junglers do, but they may not always accomplish exactly what you want. However, just because you didn't secure a kill doesn't mean the gank was a failure. Did you get summoner spell expenditures from your enemy? Success, and may lead to a kill later. Did you force your opponent to back? Success, free farm and push to their tower if you can to deny them farm. Did you draw the attention of the enemy jungler? Relative success, now your ally laners can be more aggressive. Ganks can secure a safe Dragon kill, jungle invade, and of course, tower as well. Successful ganks don't always mean a kill secured, and in fact if you fail to do something besides just kill the enemy and back, then the gank isn't as successful as it should be.
OBJECTIVES SECURITY
Here is where the jungler's endgame lies. Securing Dragon and/or Baron gives his team a tangible advantage, both in combat stats and in gold. If he is moving towards Dragon (and isn't a post- lvl 6 Nasus or Shaco), start heading that way too from mid/bot. Every jungler should have Dragon and Baron at the top of his priority list, as these are his greatest responsibilities on the team. That means he may be in the Dragon pit when top lane gets ganked, or pinging like crazy to do Baron after a successful 3-for-1 teamfight.
In my opinion, the jungler has more tactical "irons in the fire" than any other position. He has so much to consider with every step he makes on the Rift and has a ton of responsibility throughout the duration of a match. I'm not dismissing any other position's tactical responsibilities by any means, but it is so easy to forget that at any given point in a match, the jungler must be thinking 2-3 minutes ahead at least, if he wants to be successful.
So in honor of the U.S. holiday Thanksgiving, thank a jungler today!
to quickly rush to your lane.
, while you guys at bot can't even manage to kill off a 
bot when I swore the enemy jungler never even touched your lane. Of course I didn't gank bot cause of all the OP wards enemy placed, but I'm just here to give enemy lane pressure, not win your lane. I come, they spotted me, they back off, and that's good. You already have more time to cs before they manage to get back on their feet after I left. You die again to a 2v2 fight, thats all on you, not me.
