If you actually read his criticisms instead of simply going straight to sarcastic remarks, he does have some good points, although OP, I think ranting a bit too much about racial changes that are very subjective.
As for your overall idea that Act 1 was extremely good, and the quality starts to drop after that, you're not alone, many people have noticed the issues.
Act 1 was beyond excellent. I'm starting to realize that I actually hated Act 2, and I do not say that lightly. I think Act 2 makes for probably one of the worst sections of an RPG... almost everything about it was unsatisfying: the narrative, the reactivity, the exploration, the scope, the character development, the choices, the structure of activities, almost all of it.