From what I have seen, the general excitement for this gen is higher than in the past. I feel the same way, but I'm not totally sure why.
Maybe its because the DS was around for such a long time, that it has been ages since we had a pokemon game on a new system. Or maybe its because the graphical leap this time seems bigger than any time in the past.
We are also getting some nice new features, such as mega evolution, character customization, and several other things that will probably make the games more enjoyable.
I guess it is a combination of all these things for me.