Persona Q is the best SMT game ever made, and one of the best dungeon crawlers ever made.
The game manages to marry character-focused party members with the collectathon gameplay loop of most monster taming games in a way that not just has the benefits of both, but elevates them to new heights.
Fusing personas is far more fun when you have to take into account how it will compliment a set characters base stats and abilities, and forces you to be far more strategic in what you're making. At the same time, you can also be far more creative and free with your creations as the pressure to cover all your bases is lessened when you're already doing that naturally.
The characters are over-exaggerated, but this plays to the games benefits as it makes an over crowded cast far simpler to manage. By reducing each character to their barest traits and hypercharging them, the group becomes more of a cocktail of various caricatures, and the fun is in throwing them at each other.
The soundtracks fusion of the P4 and P3 styles is incredibly interesting to listen to, and it works incredibly well.
All in all PQ is great and the fandom are a bunch of meanies.