If I found myself talking to someone who had used web2py, I'd be very interested in their critique, but sadly in every case so far, it's been second hand.

Going back to the original discussions about this, and discounting the unnecessarily intemperate language used, it seems to boil down to web2py's conscious design decisions being discounted as "Pythonic heresy" - fair enough if that is your PoV, but that's a long way from "a fundamentally incorrect way to approach web development".