I wouldn't be surprised if it did get delayed again, we're at the point where open world games [specifically Rockstar's open world games] are these Brobdingnagian fucking behemoths. Coming along with that, I think there's almost no fucking way it doesn't end up being a disappointment on some level. The hype built up around it at this juncture is unachievable in practice, even if it's a perfectly fine game that builds on what came before it. It's like Cyberpunk 2077, CD Projekt Red acted like this game was going to be the future of gaming, it was going to redefine everything we thought we knew about game design, it was basically going to be a life simulator. Then it releases and [after months and thousands of hours of bugfixes to even make it playable] it's a relatively coherent action RPG. Once you over promise to that extent there's just no fucking way you can ever deliver.
I think it looks largely fine from what I've seen but I have some reservations about it, the map looks great but at the same time if Rockstar has reined in some of their worldbuilding [likely because it's 'too offensive' for modern audiences or some other such bullshit] it could very easily feel pretty barren, lifeless and without charm. The map in GTA V was already showing some signs of having less charm than previous iterations IMO. Liberty City in GTA IV or of course III had a lot of charm, Vice City had charm out the ass, but GTA V was basically just a scaled-down photocopy of L.A which is neat to see in a videogame but the real place doesn't have much fucking charm either. So in that aspect, I suppose that it's a realistic portrayal of L.A. Likewise a lot of the people who were responsible for much of that charm in previous installments are no longer with the company.
IMO I think it'll come out and get incredible fanfare at first until people start really digesting it. It will basically be the opposite of GTA IV's trajectory which was hype, disappointment followed by years later people recognizing GTA IV as being ahead of its time and really pretty fucking good. With GTA VI it will be hype, elation and then a slow realization that it's mediocre or "just good enough I guess". I don't think there's any chance it bombs or is a complete dud but I also don't think there's any fucking way they deliver what people are expecting out of it at this point. If it does bomb or have a Cyberpunk 2077-esque launch I'll be pretty fucking surprised.