The game was a major disappointed to me.
Story-wise Yakuza 4 is really the worst one of the series,If it was just about Akiyama it might turned to be something good, after his arc everything went downhill to hell, It's not just the stupid cliches or the smh-worthy chain of betrayals and, the entire thing felt so stupid and everything was just a fucking rehashed plots, it was like an unfunny parody of Yakuza stories.
Story overall.Yakuza 1=Kenzan >Yakuza 3>Yakuza 2>>>>>>>>>>Yakuza 4
But it's not only that, even the side quest just sucks smelly ass and hairy balls here,they feels soulless compared to the previous installments, most of the side quest bored me to sleep, that never happened to me before Yakuza game, I love the side quest in Yakuza games buy not in Yakuza 4, it seems like they put them here just because other Yakuza games has them, and the game is just short (I mean really really short) without the side quests.
One City was also a major major disappointment here, we got two cities in Yakuza 2 and Yakuza 3 then downgraded to one in Yakuza 4, yeah it's now has more areas with roofs and shits and more lead characters, but it's still the same city.
And even on the villains side, it's the weakest Yakuza game, it's not even funny, there is serious lack of badass evil Yakuza guys, we goot badass motherfukers yakuzas in the other games ( and fucking Yusaku Matsuda's hottest son as Sasaki Kojiro in Kenzan) here wat..nothing only bunch of boring idiots ,and only Minami was kinda decent(but just got disappeared completely halfway through).
Series overall
Kenzan>Yakuza 1>Yakuza 3> Yakuza 2>Yakuza 4.
If there is a Yakuza 5 after Yakuza the End Zombie one I hope Toshihiro Nagoshi and his team get their shit together again.