Sasuke was called a genius multiple times in the manga and to say he's not is completely false. Sasuke beat dederia because he figured out his element. That's a genius feat. He planed and prayed on orochimaru and beat him when he was weaken.. That's a genius feat. The sane with Danzou..Sasuke wasn't a genius though, he was a prodigy, it's not the same thing. When he countered Itachi's genjutsu it was because of his talent, when he mastered Lee's taijutsu it was because of talent, when he invented Kirin it was because of talent.
Geniuses are the likes of Shikamaru, Itachi and Minato, they have prodigious skill but their intellect is what stands out the most. When you look at their fighting style you can tell they rely mostly on their ability to analyze the opponent, when you look at Sasuke he relies less on rational thinking and more on his prodigious talent, like Madara.
Fact is Sasuke and Madara can do both.