I don't understand why you insist..You can say that you believe that we've overpaid for him, but you can't say definitively that we have, so don't.
He was named in the PFA team of the year, perhaps also subjective but i'd trust their judgment over yours especially as your methods haven't exactly convinced me. Wether the PL is the best League in europe or not is debatable, but for a player to perform like he has (at 18 years of age) in any of the 2 or 3 best leagues in the world means alot, and of course it matters that the league that he performed so in is the same league that the club competes in.
I've already explained to you that I don't care about wether you think that his performances for us have been excellent or not, that's not what i'm taking issue with. My problem with you is your willingness to write a young player off for making a few mistakes at 19 years of age, add to that the "mistakes" he's made aren't even that serious to begin with, Another of our record signins; De Gea made alot, ALOT, of mistakes at his start here that were far more concerning than the ones Shaw's made. Were you as quick to judge him as you've Shaw?