I take it back, Gus was smarter. Walt loves to think he's too smart & it makes him sloppy. He is smart, but i think the scene that shows that he's not as smart as he think is Hank's death scene. Even with he gives Jack specific coordinates, after he kills Hank he mocks the directions & was curious was from the start meaning he's not as dumb as he looks. & when Walt is begging for Hanks life, thinking he could out smart of the situation but in reality, Hank was smart enough to point out that he was too stupid instead