Alright, I'm about 16 hours into P4G and I'm completely hooked!
It looks and feels great on the Vita and I love both the combat system, the exploration and the plot sequences. I've never played a visual novel style game before so the way you advance plot and social links feels fresh and exciting, and the combat itself is both simple and at the same time relatively deep in terms of tactics for a jRPG. Nowhere near Disgaea of course and can't really say how it compares to the likes of FF VII (if from now on the only change is going to be bigger numbers then it's simpler, but the fact that you pretty much have to rely on enemy weaknesses makes it OK in my book).
My only complaint would be that grinding the levels can get a little bit tedious with the amount of similar enemies you have to defeat, but the fights are quick and once you figure the enemies out it doesn't take much time after all.
Well, maybe I'll throw in a second thing that sometimes feels a bit off - the setting is very, very japanese animesque (duh), so the english voices make it sound a little weird at times - and for some of the characters (Chie, I'm looking at you!) the japanese VA have done a better job. Although I must be fair - most of the cast is voiced very well, so it's not a major issue at all - and this is coming from someone who's watched a ton of anime and always preferred subs over dubs.
Any tips from you seasoned Persona veterans? What should I focus on on my first playthrough?
Also, in NG+ do the enemies get harder? And is there a NG++? Is it possible to explore every single thing there is on a single save file?