It's mostly because people have their heads way too up their asses due to nostalgia. No offense, nostalgia is a good thing, but bashing on a game that has not even been released already and saying that the Pokemon "are lame or uncreative" is just a sign of pure asshattery.
Now, I'm a relatively new fan, so enlighten me. Is there some law that states that anything new is automatically cr*p, and the thing it replaced was better than anything that came before it, regardless of opinion of it before? Because that's the only reason I can think of that would explain this.
Just people with their head in their ass, basically. I heard these kind of complaints about Kirby's EPic Yarn already, with people complaining about "Kirby lost his ability to inhale!? wah wah wah" and my personal favorite:
"We are in the year 2010. What the f*** is with the YOshi's Story graphics. I bet you these people will eat their own words.
I know, kinda long rant, but I am only defending my two favorite series.