Ah ok, by the i assume you might have played the japanese version of Yakuza Kiwami 2, i heard they added stuff and cut stuff out, if its's true what did they do in particular? I do know they added the HEAT systemI will say download the Prologue demo. It is the first chapter of the game, you get a sense of the mechanics. Plus you can transfer the save to the main game. You can play baseball, karaoke, Rizap gym in the demo.
I have played and got platinum in both Japanese and English versions of 6, I have not encountered any game breaking bugs. Is it better than 0, no. You can wait for it to go on sale. There is no four styles of fighting in this game compared to 0 and Kiwami.