Well, Itachi's ?berstrong taijutsu partner Hoshigaki Kisame lacks intelligence!!! Or is it really so...? No, not really. But people tend to think so. Now im not saying everybody thinks he's dumb, but a lot do. Why? For starters: what has Kisame done that would make him dumb? Is it something he said? Or done? No, i think it has something to do with... hmm.. him not cancelling Kurenai's (one of Leaf's best genjutsu-user) genjutsu. Or is it because he got sliced by Asuma's (inivisible chakra) blades? Because if it is, i can't really see how this would make him dumb in any way. Okay, im not saying he's Einstein but he's not dumb. Against team Gai, he was doing right by taking Neji, Lee and TenTen in the water prison. Why would someone bother fighting 4 shinobis when he can reduce the number to 1-on-1? That was one smart thing, yet he's not getting credit for doing that. Secondly, fighting 4 shinobis head on would probably result in him losing, and to my point again: this was a smart move. What some guys should realize is that Kisame is eager to fight. Now, a guy who's always eager to fight maybe don't make up a plan before rushing into a fight but he is one strong character (likes destroying villages, assasination on feudal lord) and that's why he's eager to fight. He loves fighting. Like the databook says; "Desired opponent: Anyone". He doesn't care who he's up against, as long as it's a worthy opponent. But because of his eagerness he doesn't come up with a backup plan it seems , he's just "rush-on im going to kill you as fast as you can prevent it", and so far it seems that that's Kisame's way of fighting and he's got pretty far with it. That's exactly what would've happened if Itachi didn't tell him to stop fighting head on during their Konoha visit. And most likely, he would succeed killing Kakashi but suffer injuries. And most likely, he would succeed making Kurenai and Asuma "dissapear" if Gai didn't interrupt. Letting Gai kick he's face without revenge made him very dissapointed. Eager to fight is not the same as stupidity. Now, you wouldn't call Naruto dumb right, as we've seen him rushing into his opponents with pure anger? (Even if you did, Kisame knows more jutsus than Naruto, hence his eagerness into fight's would differ a lot compared to Naruto.