I love any Yakuza thread on GAF, good job OP. I have no doubt there are many aspects of Yakuza that would appeal to gaffers and despite the number of new threads and new followers lately, its still criminally underrated.
I suppose the pragmatist in me says it's still hard to see it as a mainstream type game like with Final Fantasy, Halo, MGS, Mario in the west, but I love that this series has just as many games as those franchises do. It just goes to show how much the fans love the series. It's kind of like Survivor the TV series for me, those fans will keep watching.
For those who are undecided about Yakuza, pretty much all of the mainline games are
1. It's a part virtual tourist game where you get to visit Japan (at least for us non-Japanese players),
2. Part brawler (like Streets of Rage)
3. Part crime drama (the story telling keeps getting better and better with each entry)
4. Part mini game collection (Bowling, Darts, Golf, Batting Cage, Karaoke, mahjong, shogi, arcade games and lots of other games etc)
It's an open world game, in that its not corridor based, between missions, you can visit shops, eat, buy goods, do mini games, do side quests. During missions, you get some story beats and most of the time you're asked to beat up minions and the boss. You can level up your main character and get new moves. One of the cool things when the first game came out was that you could pick up any prop off the street, be it a bike or street furniture or whatever and use it to pummel your opponents. You also have a heat gauge that when you fill up unleash devastating moves like stomping on someone's face complete with slow mo.
The Virtual tourist aspect is pretty cool too, the main area that appears in pretty much every game is Kamurocho modelled after Kabuki-cho in Shinjuku, Tokyo. Everything here feels incredibly life like. Game was amazing back in the PS2 days. Now there's just a lot more detail with everything. Walk into a convenience store and you'll see all the individual boxes, cans, drinks modelled beautifully. You can even go to the magazine rack and read comics and magazines. I do wish I could walk around and buy goods in most stores instead of selecting it from a list, though I get that a list is a lot easier.
The story in each mainline entry is what's different every time. There's a lot of questions in regards to which one to play for. Btw OP, you didn't even answer your own question
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. My answer is - if you have lots of time to invest, have all the hardware and you already know you want to play all of them and care about the story, start from the beginning Y1. Each mainline entry has a new story but with a lot of returning characters (though not every character). If you want the most complete experience play them all. If you are most interested in the gameplay, most of the games are largely the same gameplay wise (beat some dudes), so you could play the latest one first (either Y4 or Y5) and see if you like the game before going back and play the others. If time is really of the essence, then play Y5. Y4 is a terrific entry point into the series because its the first time in the series the player gets to use multiple characters (one at a time of course), and three of the four characters make a return in Y5. If you start with Y5, know that it has five "cities/areas" available, while most of the others have one or two areas available so it may feel a lot smaller in scope. The dev team spent twice as long on Y5 as the other games.
If you like mini games - you absolutely must play this game. It is god tier.
Fun Fact - Yakuza director/producer directed Daytona USA.