I'd like to say that Boktai doesn't have crappy graphics, the problemis that if you're going back at THIS POINT in time and playing them, it's like going back and playing Wario Land 1 now and expecting it to live up to the graphics of other games.
Also, if you don't like storyline over graphics than that's another reason why, Lunar Knights doesn't have 'bad' graphics it has 'old school' graphics, and because of this for people who enjoy their "OMG PS3 GFX PWN JOO" graphics, these games might suck, however for those of us storyline inclined, it's quite fun.
Oh and World War 2 games are indeed crap IMO. As for turnbased games, you can only get so many of them until you're just fking bored.