truer words have never been spoken....or written

Example?

I might have expressed wrong. My point was that you can find some parts in every level that have obviously given less thought/depth. Not rendering the level bad, but certainly calling it flawless is an overstatement.

Just because you prefered one level over another doens't make it flawed. It being flawed means there is a weakness or imperfection. Different levels have different approches, characters and areas, while all being amazing you can still prefer one over another. My first playthrough took me 20 hours so I can't complain at length. It's only quick if you rush the game.

Length could be considered as a flaw, and don't tell me that you didn't enjoyed some chapters more than others. That by itself makes it flawed 1 way or another