This is one of those titles you don't wanna miss out on.
Sadly since you play with 4 characters now that means the overall story and gameplay is divided into 4 smaller parts, meaning the individual stories will feel short and will end just as things become interesting. The story of Yakuza 4 is a dramatic and emotional one, and there is a lot of it, so be prepared to sit through quite a bit of cinematics. In case you weren't fortunate enough to experience any of the previous Yakuza games, this one offers a flashback option that quickly retells all of the story that happened so far.
Each of the characters has a unique fighting style which makes combat much more enjoyable and diverse. The substories are also divided into 20 per character, which means there are less side missions to undertake than there were in Yakuza 3, but they are still equally as fun nonetheless.
The Kamurocho district itself hasn't changed much, you will still be navigating the same old streets and places, and since it can take some time for the story to pick up and become interesting, you might feel like the novelty has worn off, but stick to it and you will certainly find great fun.
There really isn't much else to say, Yakuza 4 is a long and fun adventure that you can always come back to and find fun things to do.