The reason no one wants to jungle

Is because Leesin is the only viable solo que jungler in the game right now. Every other jungle champion is dependent on their laners doing well, AND responding to river skirmishes. Leesin is the only jungler that can positively impact a losing lane, and have a strong early game regardless of his terrible teamates.

You play anything else, youre just signing an agreement that you have no say on the outcome of the match, and youre just going to ride your team to victory or defeat.