People who hate this boss are people who never properly used the game mechanics taught to you in the first dungeon, such as baton pass, fusing personas, or taught to you by going to the darts/billiard club to raise baton pass perks.

All of this fight is just a skill check to make sure you were properly using the mechanics drilled into you at the start. That’s all this fight is.

People who struggle with it are those who ignored fusing properly, ignored the darts/billiard content, or barely used baton pass effectively.

It is not a difficult fight. It is difficult if you neglected any of the things I mentioned, despite the game handholding you to these things.