What a wild ride, to think they did very little to improve on the original and the vast majority of changes make the game much worse. The biggest bad change is the whole crafting system, which I spent ages figuring out and working on a video explaining it all because it's total nonsense https://www.youtube.com/watch?v=2e82M7zj12g&t=22s&ab_channel=AllstarBrose

On its own, Ishin is a middling Yakuza game. Middle of the road story that's really slow but has a few decent highs, a weak selection of minigames, a bad selection of substories, some of the grindiest side content in the series, and combat that loses the refinement of 5 without the energy or synergy of 0's styles. If you look at it on its own, Ishin's probably a solid 6/10. Once you compare the changes between the original release and this one, you'll question what the hell RGG Studio was doing.

First off, why on earth is brawler so weak? It deals no damage compared to the rest of your styles and the combo speed boost does not help. Why is sword so slow? Why does wild dance do so little? Why is gun... well gun's mostly the same once you put a pierce seal on one since armor takes no damage from guns. The combat does not feel good, especially when compared to the original release. Ryoma falls over if an enemy so much as looks at him wrong and you gotta sit through a two second animation. There is no herculean spirit in this game (and stability is locked to brawler) so unless you wanna be on the ground for 1/5 of the time you're fighting, get good at those blocks and dodges (of which they locked komaki dharma tumbler to unarmed instead of it being for all styles for some reason).

Ishin was already known as one of the grindiest games in the series, but they did very little to fix it initially. A lot of the diligence records were made less grindy, but some of the worst ones (like Gion reputation) weren't changed at all. The seal system was completely ruined, but the video linked above covers that. At release material gathering was just as tedious as it was in the original, but a patch has been put out to remedy this at least. This game is still insanely grindy and frustrating for that purpose, don't say "that's just for 100% completion!!!" The game encourages you to use the blacksmith. If you're playing a casual playthrough, you won't be able to craft much of anything since so much requires dungeon grinding, plus none of the systems are explained to you. It's complete bullhonkey.

The casting changes are also a big misstep, one of the cool things about the original release was that because almost every character was similar to their mainline personality, you got to see interactions that never happened before. Seeing Mine as an ally to Kiryu or interacting with Saejima or seeing Baba showing off his deceptive personality from the start created interesting dynamics. Now? Oh cool there's Kuze, sounding more bored than ever and being an underhanded, dishonest bastard for some reason. Oh wow there's Han, who's a spy and torturer but sticks out like a sore thumb and acts completely different than he did in 7 (and in 6 he has one scene where he's ruthless). Oh cool there's Zhao, being shifty and shady when he's never been like that before. The only one that really fits is Awano, but that character was barely present anyway. All of this casting just screams fanservice for people who played only 0, K1, K2, and 7 instead of having a wide variety of characters from your whole legacy.

The original release of Ishin was in my bottom 3 for Yakuza games, but this one easily takes the cake for worst game in the series to me. I can't ever see myself replaying either iteration of the game, nor could I ever recommend them. If you want a gripping story with good emotional beats, play Y3. If you want a more serious, clinical, but tightly written story, play Judgment. If you want great side content, play 5. If you want great combat, play Lost Judgment. There's nothing Ishin does better, or even close to as good, as any other game in the series. Do not bother with this one.