Uchiha and their Genjutsu wouldn't be dangerous if you could just fight while avoiding eye contact. A skilled Uchiha easily forces his opponent to look into his eyes. Kakashi told the team not to look into his eyes, yet Itachi forced him to do so. While it was a clone of Kakashi, it is not expected that the victim will always insist on clones. Shee couldn't believe that he fell for a Genjutsu of the Sharingan since Sasuke used Juugo's actions as a distraction to catch him off guard [
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]. Itachi has possibilities to distract Minato before catching him in Genjutsu as well. Notice how powerful the Genjutsu was Sasuke used with 3T; Shee was completely paralyzed and fell down. That's the dangerous point in Genjutsu, since it only requires some visual contact, which can be made in any moment of the fight, whether intentionally or unintentionally. In Tsukuyomi's case, it's definitely over.
With no intel on both sides, Itachi will be better in analyzing Minato's techniques than vise versa. If he just throws marked Kunai around the field, someone of Itachi's intellectual level immediately uncovers some s/t technique which Minato intends to use. But how will Minato uncover Tsukuyomi before he gets hit by it?
Itachi's capabilities as his techniques are greatly underestimated although demonstrated and even more hyped. One should keep in mind that Itachi never had problems in casting Genjutsu upon his opponents and always fooled them with well placed feints.
Itachi needs only eye or an other visual contact (e.g. his finger) to cast illusions and paralyze the opponent, and he only needs an eye contact to one shot him as well. What does Minato need to beat Itachi? Does teleporting him away count as a win? In the case Itachi was a threat for his beloved village, merely getting rid off of him in that way wouldn't settle it. Especially when his actions are limited to the point he needs to force himself to avoid any eye contact no matter of what Itachi will do to force him to do.
This is a balanced fight.
Claiming that Minato will blitz a wielder of the Sharingan with mere Shunshin is far fetched, since such an argument, which can actually decide the battle, needs an equivalent clear source.
Tobirama admitted that Minato's Shunshin is above his, yet he used Hiraishin to blitz an Izuna who didn't have his Sharingan activated - we don't saw Tobirama's Shunshin in action. Hence this is not an evidence of how successful Minato's Shunshin will be against the Sharingan.
There is another interesting matter. How will Minato avoid Amaterasu, if he constantly avoids eye contact to protect himself from Genjutsu? Unless you are not Juubito, you can't just sense how he is storing up Chakra in the eye and counter attack in that instant.
Nagato felt the preparation of Amaterasu by it's characteristics like air pressure of the heat, not even with Juubito's precision. We learned from the Manga, that at least ordinary sensors can't just track while fighting actively since they need to concentrate on what they are doing. Nagato wasn't fighting actively at that moment but stood next to Itachi. When the preparations were done, Itachi's Amaterasu was used so fast Nagato received it while with a smile on his face, as this technique is used instantly and leaves no room to sense it.
Ay had to use maximum speed and react at Amaterasu
via eye contact. And that's the point, since Minato would be restricted if he avoids eye contact to avoid Genjutsu.
So the final question arising would be:
How does Minato avoid Genjutsu and Amaterasu at the same time in the long run?
