So with all this rampant negativity being directed at Ultimax's narrative for the nth time, I figured I should balance things out by talking about some of the good things it offers.
1) The Roster
Misgivings about the lack of doors and P1/P2 characters aside, the roster is made up of just about every Persona character you could ask for. What's more, each character has a unique moveset and a overall theme (Naoto's instant kills, [Redacted]'s buffs and ailments, Junpei's victory cry) that make them stand out from each other. Add in Shadow characters and you pretty much have no shortage of characters to choose from.
2) Game modes galore
Arena's biggest problem was that you ran out of things to do after beating the story mode (okay well, you had online play). Sure, Arcade mode was a thing, but it was a distraction at best, and Score Attack straight up sucked. Ultimax significantly improves on both game modes, and throws in a new mode altogether. Golden Arena Mode gets some flack for being a grind, but I think it's good for what it is. Just mindless fun with your character of choice. The newly added online lobby is a ton of fun too, just be mindful of the weirdos who like to roleplay...
3) Easy to play, easy to get into
Ultimax is an easy game to get into. Even if you absolutely suck at fighting games, you can get by with just spamming autocombo. But if you're interested in going even further, it's also one of the easiest fighting games to get into. With the exception of a few, combos aren't that demanding, reversals can be used at a press of a button, and quarter circles are pretty much the only commands you'll need to learn how to do on command.
4) Playable Margaret