I'm sure he was good Hokage and husband and all that, but as a sensei he was straight up horrible. He was never around for one. All the traumatic events that Kakashi and Obito went through occured because Minato was off doing something else, which kinda eliminates the point of being a sensei of a team of young ninja. He just kept assumed that Kakashi and Obito would work out their problems, but they didn't. He just assumed that his team would be fine on their own, but they weren't. And despite already losing Obito due to negligence, he left his team alone again and lost Rin too!
Obito getting crushed and being found by Madara, Obito witnessing Kakashi having to kill Rin, Obito unleashing Kurama on the Hidden Leaf, Obito starting the Fourth Ninja War and trying to Infinite Tsukuyomi the world with Madara - all of this is pretty Minato's fault for being irresponsible.
Even Orochimaru was a better teacher than Minato was.
Obito getting crushed and being found by Madara, Obito witnessing Kakashi having to kill Rin, Obito unleashing Kurama on the Hidden Leaf, Obito starting the Fourth Ninja War and trying to Infinite Tsukuyomi the world with Madara - all of this is pretty Minato's fault for being irresponsible.
Even Orochimaru was a better teacher than Minato was.