The reason that I've come to ridicule Poke'Mon is simply because the new Poke'Mon, to me, just look like utter shit. After a certain game I began to see what they had and noticed the style of them changed. We went from having creatures that looked like real animals and, at times, objects, to having things that look like they're made of fuedal era japanese tiles pasted on an amorphous blob of clay.
Why were the Legendary Birds so damn awesome? Because it was easier to conceive a bird of flames, ice, or electricity that appeared as such. I haven't dug into the series lately but I will say I did have fun with it. Given the chance I might go out and buy one of the older games that doesn't look like it has some 2-year old's rendition of the monster under his bed on the front cover.
Getting away from such a shallow point, the game's gotten repetitive with only minor editions to it. The core game is the same thing, and I don't just mean the RPG element. I'm talking about the story. Get a poke'mon. Go around the world to collect them. Fight and battle your favorite ones to higher levels and pwn some gym leader. Go beat the evil organization and the big bad asses at the top of the game. End. It's always the same shit, and they still impress the whole 'buy two' versions just to 'catch'em all.'