One Shikamaru fight contradicts the general pattern Uchiha Barles talks about.
He lost to Temari because he was out of chakra. He won against a random female during the Chuunin exam. He ran out of chakra when he tried to stop the 7 ninjas chasing after Naruto, Sasuke, and had to be rescued. He lost against the pink haired Sound Four girl because he ran out of chakra, and had to be rescued.
The only example of his smarts actually winning a fight against a strong opponent was against Hidan, who was dumb as dogshit to start with. And that was after Shikamaru and his team got creamed by Hidan and Kakuzu, to the effect of losing his sensei.
I disagree with Barles, at least partly though. Teamwork has been shown to work pretty well a few times. The team that finally took down Kakuzu is an okay example.