LOL
The Shenmue concept is basically a martial-arts revenge movie (80s style) drawn out into a series of 3D adventures.
Both games were very ambitious for their time since they took place in fairly dense 3D environments with people walking everywhere going about their business, has a day/night system.
Walk around and talk to people (LOTS of talking, full voice), lots of cutscenes plus interactive events (which probably inspired those of RE4) and find clues like in RPGs, and when you get into fights, it's sort of a compromise between simplified Virtua Fighter button combos and Final Fight gang fights. You learn new moves from different masters and other sources.
I find the martial arts cinema themes and cliches entertaining plus the martial arts mentors and villains and the lowly henchmen are fun to beat up.