1: You can't compare a normal Uchiha to Itachi, who was a genius AMONG geniuses. Madara was the only one to have controlled the beast, a lot of people knew that. Knowledge goes to Itachi who seems to know everything that happened that night and even knows that Minato was Naruto's father.
Minato looked straight into Obito's eyes while running at him, no denying that, no ambiguity in the scan.
Kushina could have taught him that seal for all we know and we don't have any proof suggesting that it was especially made for Uchihas.
2: Minato's reflexes are better, but you overrate it. And you even compare his shunshin to KCM Naruto? They were obviously talking about FTG, not his shunshin. His shunshin is probably better than that of Itachi's, but it isn't going to be a game changer simply because Itachi isn't much slower and he has the sharingan. Itachi always places people in genjutsu without a moment to spare; it never takes time to cast it, always practically instant.
3: Sensing isn't going to do anything and you know it. Why else would Kabuto, who is a much better sensor than Minato, feel the need to cover his eyes. Not only that, but Minato has to actually know that he's in a genjutsu on order to actually check his chakra since he has to SWITCH into sensing mode.
4: This is actually a legit counter IMO, but it doesn't seem to be something that will fool Itachi seeing as he found the real Naruto and knew that it was a Kakashi clone.
5: Itachi's shuriken skills are greater than Minato's, don't even know why you would bring that up.
Minato can only defeat Itachi through getting close, but getting close to Itachi is suicide because of genjutsu. Looking away doesn't even help because Itachi has other means of placing people in genjutsu along with other dangerous techniques. And hey what's stopping Itachi from placing Minato in genjutsu the very beginning of the fight?
Seriously though, every time you guys make it seem as if Itachi's the slowest guy ever. Kakashi kept up with Minato when black zetsu took over Obito.