I know it has flaws. Some of them completely alienating for most people. But damn it, I don't care. The Yakuza series is just about my favourite thing on the PS3.
They just do so many things that other games aren't doing. They are (sorry Sleeping Dogs) the single best way to indulge in virtual tourism, so thorough are they in recreating the everyday minutiae of Japanese city life. They've got, I think, the most vicious combat system going around. Maybe not the most elegant, or the most finely-balanced, but there's a heaviness and brutality to it that, even 100 hours in, never stops you wincing when you smash a bin into some guy's face.