The Shenmue series is an interesting one for me. On the plus side, Shenmue 1 is the most atmospheric game I've ever played; few games have gotten close to the level of immersion this game had. Just walking around the streets, seeing the shops close a the right times, seeing people Ryo knew going about their daily business etc...amazing. Also, the music was brilliant, the graphics were/still are stunning, and the attention to detail is jaw dropping. Even more, some of the cut scenes are just geniu - how about that whole motor cycle sequence where Ryo fly kicks a dude off a motorcycle, jumps on and chases the thugs!? AMAZING. The fighting was great too. On the other hand though, the game often lacked direction and you'd find yourself wandering around for ages, and simply find yourself getting bored - this happened so much that it really was a real detractor from the overall experience, I'd even say the only truly major one. Overall, Shenmue was an amazing game.
Shenmue 2 though, although a better GAME than Shenmue 1, was not imo, a better experience. It just lacked the atmosphere of the first, and the world just wasn't as convincing, going for a less real, more gaudy, flashy look. It did however have better pacing, technically better graphics (although IMO it only looked more aesthetically pleasing than the first on the final disc), a tweaked fighting engine, the ability to speed up time, etc etc...overall though, I enjoyed Shenmue 1 more; the world was just so convincing. Also, it was such a nice change to play an rpg set in a contemporary, real life setting, and more games need to follow suit.