All in all, to me the amount of new ones really didn't affect gameplay at all for me. Maybe it's just that you guys wanted to see more new Pokemon, for the sake of having more new Pokemon, I don't know, but in my opinion game freak did it right.
**However, I can say I am severely disappointed at the amount of legendaries and I was never one to complain about having too many.
As far as mega's go, I'm fine with them, they gave life to old, forgotten Pokemon (some at least). However, new prevos or evos would have been good too. Which I don't see why they only did it for Sylveon.