I really like some of them. P4G was really fantastic.
Innocent Sin has a great story, even if it's one of the easiest games I've ever played.
My interest in the series was completely killed by P5 though. The game peaks in the first 10 hours, and is massively massively drasn out with no interesting story or characters, dumbing down in some ways of the gameplay, new mechanics are either redundant (e.g. negotiation - which you don't have to use at all) or make the game stupidly easy (e.g. baton pass).
I finished it to completion but was really disliking it from the 4th dungeon.
Spending the insane amount of time on it that I did is one of my biggest regrets so far, and I have not followed the series ever since.
To be semi-political, P5 just completely lacks depth and you can tell from its politics. Characters go on about how we need to change things so that young people have jobs, the elderly are cared for, etc. But it offers no solutions and shows no nuance. It's just generic platitudes that I don't think many people across the political spectrum would really disagree with, even if the game is selling itself as being a bit more liberal (e.g. that politican character).
The series was ovviously never fully 'adult' but P5 was the first time I ever felt like it was infantile.