I 100% see that it is satire and respect almost all of its narrative choices, even the torture scene. But that doesn't mean that it is fun to play. It just felt really draining to have to inhabit these characters for dozens of hours, rather than watching a film about them. Something about playing a game forces you to empathize more closely with "your" character, and it is so draining for me when that character is a dick.
I think it gets 10s because of the attention to detail and vast amount of stuff in it, but I agree that underneath all the polish and glamour it is just an average game with some very dated mechanics.
Weirdly enough, it is the story that makes it worthwhile, even though it was not relaxing to me it did have some amazing moments of both satire and just hilarious situations. I also really enjoyed Franklin as a character and the contrast with Michael (who you could argue is actually a worse person than Franklin).
I think 4 runs decently now though? I have it installed on Steam Deck and that seems to handle 60fps well. I have only played around an hour of it, as I didn't feel in the mood for that type of game then.