Those that have called this a soulless cash grab really haven't played more than a handful of hours, initially I was rubbed the wrong way as well because the change in atmosphere is immediately noticeable, though I don't think you can keep that same feeling it originally had considering the evolution of gaming and the time gap of release, recently noticeable with the Resident Evil 4 remake as well. The more I played it the more I loved it and while I still prefer FES, it's better to look at Reload as a companion piece rather than a replacement.

A lot of problems the mass had with the original release have been fixed to a certain extent here, people griped about Tartarus always feeling the same, the Tactics system not allowing for creativity (there's even a well known mod to allow for controllable party members in FES), the general lack of content in spare time you had to experience, but Atlus listened to a lot of the criticism and touched upon what's dated. I love Persona 3 for all of its flaws and it wouldn't be the same game without some issues, so to say Reload is Persona 3 "perfected" would be an overstatement as it has an equal amount of problems, but that's moreso because it's Persona 3.

I appreciate Reload so much for offering a different perspective on the characters and story, one easier for modern audiences to get to experience while delivering the same emotional response that it's always had with its gut-wrenching final month and more importantly, I think Aigis was done better in Reload which is arguably the most crucial aspect to what makes the game as impactful as it is, for its core themes. There's so much more optional character interaction this time around that really fleshes out the main cast, and even Takaya believe it or not.

Is it the "definitive" version people have sought out ever since the release of Portable? It's still a difficult question to answer even now... I think you can't go wrong with Reload if you don't like the idea of going back to an older release, though if you're patient and want to answer the "definitive" question yourself, play FES and then Reload in the future.