Even as a big Ryu Ga Gotoku fan, I would've been fine with story changes, after all Yakuza games get really silly with their storylines and sudden plot twists. However, this show makes no sense and it doesn't respect the source material at all. Kiryu is shown to be a polar opposite of what he is in the games, like all other characters including Kazama, Yumi and Nishikiyama. I can understand trying to have the characters grow as the story progresses, but this was terribly executed.
Not only that but the lore changes are completely awful and pull you back from the story. For instance, Kazama being away from the Yakuza, instead of being this behind-the-scenes mastermind? Really?
The sets and the overall costume design are awful too. It simply doesn't look like the characters are in 1995 nor 2005. No visuals nor looks match the iconic first two decades of Japan's Heisei era. For instance, where is Dojima's mustache? Everyone looks like they walked straight from 2024. Tokyo Vice, another Yakuza Crime show that came out in the last few years, has no issues portraying this era with beautiful sets and having people wear correct attires. The set designs don't reflect the epic/grandeur locations of the games, which is a bummer, as this show would've benefited from those opulent locations.
Overall, I am torn that this came out as terrible as it did. I wish the writers took better care of this source material. I am not saying that changes weren't needed, but this is the complete opposite of how the games are, and even ignoring that, this story is simply not good to stand in its two feet. There are a lot of complete remakes, such as Scarface (1983) and Battlestar Galactica (2003), that manage to be their own thing without disrespecting the source material. Here, unlike those, the writers clearly thought they were improving upon the original story, instead of trying to reimagine/ make their own thing. Well, the overall result is as weak as watery grape soda. No, it's not grape juice, this is just water with some grape in it. Awful.