I haven't played the demo, but yakuza 3 was nice. The graphics were outdated though, kinda distracts from the experience sometimes. But the pre-rendered was good enough and the voice acting was great. Yakuza 3 also has story from both yakuza 1 and yakuza 2 so you never feel like you are missing the story, and hence you will automatically get sucked into yakuza 3's story which is told really well.
The voice acting is in japanese though, in which language is yakuza 4?







