Two counter-intuitive behaviors with Wukong's abilities:
The first counter-intuitive behavior is that Wukong's Ultimate seems to be weaker than other similar non-Ultimate abilities. Unfortunately, Wukong's Ultimate (which bears a striking resemblance to Garen's famous spin-to-win Ability, as well as others) is far easier to interrupt than that non-Ultimate counterpart. This is counter-intuitive, as one would expect an Ultimate to be better.
You could say that I'm comparing apples to oranges, but recently, in a thread where the players were trying to consolidate all of the bugs they had noticed on Wukong, Riot Nyandalee stated that a seemingly counter-intuitive behavior on Wukong's "Decoy" ability was intentionally coded with that behavior because Riot wanted consistency with Shaco's "Deceive" ability:
When you stealth, you drop aggro which resets the jungle mobs. Even though a clone takes your place, you are the target attacking the jungle creep and thus, when you stealth, that aggro is dropped. If you notice, the clone does in fact draw aggro when he does his spin at the end of the duration.
(This is similar to how Shaco drops aggro when he stealths... even if there is a champion standing there, if the champion doesn't attack the mob, the mob will reset.)
Riot: Please consider these issues.