Bijuu mode isn't Minato's hax, Minato himself is a hax. So to even this out you're going to have to restrict Minato in general.
I don't agree. Minatos abilities fits perfectly with the shinobi world that was introduced to us in part 1. Where skill, tools and jutsu were all used in battle. I would say that Minato was the last classic shinobi. Definition should be clear in a minute.
Naruto hax abilities started with the susano, but didn't become common place until the war arc. Feats such as:
Bijuu mode
Eternal and perfect susano
Izanagi
Izanami
Controlled tailed beast bombs
Ten tails obito abilities
Jinchuriki Madara abilities
So6p narutos abilities
So6p sasuke abilities
Tsuchikage wrecking ability
Power started to mean more than skill in Naruto and that is the hax