Finished the game the other day. I would say it is about a 7/10 for me. It's not bad, but feels pretty lacking compared to the Persona series.
A lot of the party members don't really feel like they have much of a reason to be joining your party when they do, and some of them join pretty late, so there isn't as much chemistry as there is in a Persona game. The overall story and writing is a bit weak.
Many of the game mechanics feel lifted from Persona (obviously), but don't have as much meaning here. For example the calendar system makes more sense and has more to it in a Persona game. The game takes place over 1 school year, there are events and such that line up across the year. There are school days, summer break, club activities/jobs on certain days etc. Managing your time is a gameplay element where you have to make choices in how you spend your time, whereas in Metaphor it's kind of arbitrary and the only real purpose is to give you time limits for completing dungeons.
It just feels like there is less stuff to do in general. The last 10 days at the end of the game, I had all the social links maxed, stats maxed, etc and nothing to do. And the game wouldn't let me go to the final dungeon yet, so I am basically just sitting there sleeping through the time periods. And a lot of the game felt like that.
There were also some weird game design choices that were kind of annoying. Individually they aren't big issues, but they kind of add up. For example, when changing archetypes you are forced to change your equipment. ie if you have boots on with 100 defence but some added bonus you want, it will always equip your character with the boots that are 110 defence but no bonus, so you are constantly re-equipping. Or how some battles require a certain character to be in the party, so before you start the battle it removes the characters in your party except for the required ones, even if you already had the required ones in your party. Or how the only way to cook is when you are travelling on the ship. Etc.
The music is pretty good though.