Well, he's strong, but there are a few points that I feel are necessary to make (coming from someone who doesn't play wukong at ALL, I don't even own him):
- Pretty sure he can't auto attack while using his ultimate. If his AS = 1.00 for example, that's 4 missed autos (400% AD) while using his ultimate. Sort of makes sense why it has such a large AD ratio then...
- His win-rate is probably more driven by the combination of his having stealth, and players rarely reacting to that by upgrading to Oracles. There's a reason he isn't a staple pick in the LCS or other high elo's (his overall pick rate is under 5%) - he's countered by a 250 gold upgrade that every champion has access to (same applies to Shaco).
- He needs to use his only dash to engage on your back line, meaning if peeled your back line has a fairly easy time kiting him. My last game against him (as Jinx) he dashed on to me when I was taking a turret. I fought 1v1 as I knew my Malphite was coming, as his last auto was about to kill me I got Face of the Mountain active on me and Malphite ulted him to give me space to kite, and I subsequently killed him without taking another hit. As you should know, Jinx is really not the greatest kiter (my E was on cooldown from the start of the fight too, although I did use my ultimate as an execute), so I think that really illustrates how easy he his to kite.
He has weaknesses. Overtuned? probably, but there are bigger fish to fry.