These have a lot in common with the first two games, particularly the gameplay. No calendar, first person dungeon crawling (only Persona 1 had this), ALL characters could have Personas other than their default one (it's sub-personas, so slightly different, but still very similar to what was in the first two games, minus the compatibility). I know the writing is goofy nonsense in both games, with the nature of them being spinoffs. I have only played Q2 and was really enjoying it (I need to finish it some day).
I will not let this go, and seeing the fact that Strikers even has an adult character in the cast gives me a glimmer of hope that maybe, just maybe, we'll get an all-adult cast in Persona 6 (even though I doubt it). I recently experienced Persona 1 and the 2 duology as well, which is what makes me go so hard on this.
And make no mistake, I do NOT think 3/4/5 are bad games, and in fact they're very good. The whole series is high quality. Hell I even rank 5 second to Eternal Punishment.