How trash is Wukong jungle?

Its not trash. Extremely high kill potential at all times. Ganks cant be detected with his w. Its very easy to get ahead with wukong and get an early kill. One your ahead, your ult melts people. I see no trash with this.

His only real issue is that he's really squishy, so his first couple of clears can really do a beating on him.

He's actually a fantastic jungler post level six, much like Rengar and a few others who start out really squishie, you're going to want to take some potions with you.

One of the best junglers. Not sure why he is over-looked in competitive play.

Well he wasn't picked or banned at all so there's your answer.

I was thinking about picking him up but then I thought he needed a lot of items to be effective.

Or is elder Lizard enough for him? Can you win games without being fed?

Yasuo+Wukong=Freelo.

He's really weak compared to them as he has no real damage mitigation or regen outside of items. Also Wu's early game blows REALLY hard compared to Kha and Lee, so if he gets invaded... not much you can do in a 1v1 or 2v2 barring some major outplay/mistakes. Later in the game he just becomes similar to how he was as a top laner, just with less, equal, or more gold to if he were a top laner depending on how well he did. He is a late game monster and his late game damage/teamfight is probably superior to at least Lee and possibly Kha. And what I mean by late game is like 4-5 item threshhold, so LATE game. Ya, Lee can inSec and Kha and goomba stomp, but Wu's engage and damage late game are pretty beastly, especially with how tanky he can/will get.

As far as jungling he is probably... okay, just farm to 6 and pray for no invade(like any other tank jungler).

I main Wukong Jungle. He is very vulnerable at first levels, to damage of camps and counter jungling. He needs help with first buff to be pulled, otherwise when you collect buffs and one additional camp you need back to refill your HP. But your gank potential starts with level 3. Max your "E" to clear camps faster then "Q" for maximum burst. Always buy Elder Lizard, even if you must play as a tank.

I was thinking about picking him up but then I thought he needed a lot of items to be effective.

Or is elder Lizard enough for him? Can you win games without being fed? He doesn't need a lot of items, but when teamfights starts rush some HP(Giant Belt or Spectre's Cowl depends against you fighting)

As compared to Kha, Lee, etc..

He might not be Worlds-worthy, but he still seems to be very strong in Solo Q. I rarely see him in ranked, but when I do, he shines in that jungle.

I find no issue with him other than mana. Early on the blue will need to be yours which I don't like. I prefer to give it to mid-lane. But if you don't mind or counterjungle well, Wukong's solid. I did pretty well with him my first time in the jungle with him. He's strong all-around.