I've never played Generation I so I can't really say much about it, I love Generation II it's my favorite, it got me into Poke'mon, and it is fun because of the Epicness of it, and I know that term isn't applied much to Poke'mon but it was! Then there was Generation III and that one in my opinion started a decline in both the games and the movies. Generation IV was fun, but the story is kinda getting old by now... and the Poke'mon look like a 5-year-old drew them. (No offense meant anyone, especially Nintendo) I haven't yet played Generation V but I probably will, just to see if it's better than D/P.