As for stats.... I like the IDEA of having stats for monsters. I hate the execution of it.
Having the 6 stats means that you have 6 bonuses which affect every damn aspect of creature creation. 16 Dex? Well that's gonna give +3 to Ref, certain skills, Init bonus, Armor...
That alone makes monster creation far more difficult than it ever was for previous editions. Player creation should be detailed, customized, involved. Monster creation should be FAST.
I really think there should be two different stat "systems".
Think about it. All you really need for 99% of your encounters is: +to hit, damage, AC, Saves, and hp. 7 numbers plus special abilities. You typically do not need to know how long a hobgoblin can hold his breath underwater. Give me a fast monster creation system, and let me approximate the details that hardly ever get used. It's a trade I'm willing to make for adventures which are nearly twice as long since you no longer need page long stat blocks.