Well, if it's something Rockstar is not famous for, is rushing out releases. GTA V was released in 2013 and they probably started working on GTA VI right at launch if not before that. So rest assure, it doesn't seem rushed.
Besides, most if not every game looks like trash until just ahead of proper launch, that's just the state of game dev.
To be fair, Projekt CD weren't famous for it either but it's becoming a much larger trend and the last release from Rockstar for GTA that I remember was widely considered rushed.
Projekt CD always had buggy releases, remember how The Witcher 3 was at release?
In comparison, last big release Rockstar had was Red Dead Redemption 2, and I don't think anyone would call that game rushed in any way, it was very polished at launch.
As I recall, Projekt CD had a few sleeper/cult hits, all of which were very buggy, and then a single run-away success. After that single mainstream hit, they promised the Moon for their next release and got bit by the overhype they created.
Rockstar on the other hand has been making consistent hits again and again for years, without overextending themselves.
Besides, most if not every game looks like trash until just ahead of proper launch, that's just the state of game dev.