As monkeyking, If Wukong falls behind, it will be really hard for him to get back into the game. Wukong relies on being a nuisance and getting an early lead to take over the map.

His y is his only real disengage tool. Once that is down, or if he misuses it, his enemies can easily kill him in lane.

If Wukong falls behind, he can build tank, but he will deal little to no damage in a team fight. Keep this in mind, but be prepared to adapt.
 As monkeyking, If Wukong falls behind, it will be really difficult for him to get back into the game. Wukong expects to be a nuisance and get an early advance to take control of the card. Its there is his only real disengagement tool. Once it is down, or if he abuses it, his enemies can easily kill him in the way. If Wukong falls behind, he can build a tank, but he will only do little or no damage in a team fight. Keep this in mind, but be ready to adapt.