User blog comment:Obyvvvatel/The 4 gold attributes of jungler champion./@comment-4038126-20130212095516

1. Good crowd control effects. 2. Mobility/gap closers. 3. Invsibility. 4. Quick camp clearing and jungle sustain.

points 1 and 2 are the great ganks aspect of a jungler. Take pantheon for example. He has crappy clearing and sustain, but his ganks are too good. Thats why panth as a jungler sees more play than jungle warwick, cause he can gank at any level (besides 1) and pull it of succesfully. However, good jungler dont need that. All they need to do for a succesfull gank is to scare the enemy away, possibly wasting a summoner. As amumu, its more beneficial to try and walk to them from behind with red and hit them than using your stun right away.

I dont consider invisibility as a factor when im picking a jungler.Junglers who fail their dueling horribly, like a maokai or amumu, get picked even though the enemy jungler can make their lifes miserable. And no, i dont count any items when i say that, cause you should never know what you will build as a jungler before the game starts and you get an idea about the opposing players playstyle.

Last, while i thing fast clears are needed, i dont have a problem if a champ doesnt sustain in the jungle. Examples: Jarvan, amumu, nautilus. Jarvan is an overall good jungler, whose ult panics the enemy team and makes them roll over their kayboard most of the time. While his timers are good, he doesnt sustain at all besides pots (again, not counting possible lifesteal items). However, he gets picked cause he is a jungling cc machine with a manly ult and square jaws of awesomeness (and he is a commando). Amumu doesnt sustain, and he is almost a perma ban. Nautilus also doesnt sustain, but is deadly at the hands of good players, simply cause he clears well and has 4 cc.

Also, you forgot the reason olaf gets picked: late game dominance. Simply put, compare junglaf's late game with jungle renekton's. Olaf will do his thign, rushing in and killing a carry while ren will just AoE their team and stunning someone one or two times. Some junglers get better as the time goes on while some get worse, with Shaco coming in mind.

Now about jungling Renekton, dont try him in the jungle unless you have experiance in jungling and know how to gank with him. I think he is better as a solo laner though.