What about earlier in the kage summit where he threw a temper tantrum and punched the desk.
Or when he could think of no better solution than kill Naruto *since* he has less experience than my brother
Or when only one person has every evaded his attack (therefore its not actually a measure of strength but speed) that he rests the fate of the entire world on Naruto's speed.
Or having to ride on the coattails of Tsunade when she said she was going to battle (apparently it didn't occur to him that all kage power was helpful)
OR what about after his fight with Sasuke when he ripped his arm off with no way to get another one and screwing himself to hulk smash.
Or what about when he looked directly into Sasuke's MS.
You're being biased and intentionally ignoring some key facts.
For one, A was the one that decided that something needed to be done about Akatsuki and called for a Kage meeting to ascertain the other kage and village's loyalties.
Sure he threw a tantrum, but you clearly ignore the intelligent points that were concerning him during that tantrum.
If you'd actually listened topm what he was saying during that 'tantrum', then you would know that there is nothing stupid about A. He questioned all the village's loyalties, and rightly so, asking why he should trust konoha, who have the most Akatsuki members (Madara, Tobi, Sasuke, Itachi, Orochimaru, Nagato and Konan were also trained by Jiraiya), he then questioned Iwa's loyalties. who had done nothing about their jinchuuriki being captured and were known to have used/worked with akatsuki in the past. He also questioned the Sand because they had also used akatsuki and theior former kazegake had dealings with an Akatsuki member (Orochimaru) before his death and questioned kiri for their secretive nature and because of being rumored to be the true origines of Akatsuki. He wanted the other kage to explain themselves so that he can decide what to do and also he wanted to ascertain their loyalties.
And can you blame him for being oissed, Akatsuki captured his dear brother, they are all facing the akatsuki crisis but instead the other kage at the summit (besides Mei) wqere busy throwing childish insults at each other (Danzo, Onoki, gaara), if anything, A was the most mature and wise person there (not counting Misfune), he just has a different way of showing it.
As for Sasuke, obviously A was pissed and emotional at the time, the guy had 'killed' his brother and Naruto was selfishly trying to convince A not to punish sasuke (an S rank criminal with many crimes) beofre the summit. His fighting methods are questionable, but do not neglect the fact that at the time A was the only one that seemed to be willing to shoulder the responsibility of ridding the world of the Akatsuki, all the other Kage were either fence sitting (Onoki, danzo, and even Mei at the start) or protecting the criminals (Gaara and Naruto trying to protect sasuke). who wouldnt be pissed under those circumstances. Mayn even Misfune acknowledged A's interlect when the kage started working together, once again A immediately took chrage and came up with solutions and ideas in order to handle the situation, causing the other Kage to trust him as the head of the alliance and Misfune to recomend him.
Dont confuse being immotional with being stupid, A is far from stupid, and mos def WAY smarter then Guy.
As for A entrusting his will to Naruto because of speed, that was talk non jutsu yo, we all know that Naruto will win the war withn talk no jutsu in the end, itsd been the theme since the beginning, he just sprouted some nonsense to make A convert to his side, just like he did with Nagato and Itachi at the forest, and many others.
Sorry for the long post by the way, but I hate it when I see these types of subjective comments about A.