If you actually take in some football with an open mind you'd know that he's been very good this season, both for his club and England. Even last year when he did play, he was good, especially against Chelsea.
If we were picking a current Manchester 11, he's arguably the only rag who'd get in it. He's quicker and a much better one-on-one defender than Kolarov, and while Aleksander is regarded by some as the epitome of the modern attacking fullback, Shaw's one assist so far is one more than Aleks, who's scored one more. Shaw's passing % is also slightly better. Considering he's playing in an inferior team and has only just turned 20, that's impressive.
He got in the PFA team in his last year at Southampton, and I reckon he'll be in it this year as well. Considering it's been, and will continue to be, a problem position for us for a long time now, I'm surprised we didn't move for him to provide a solution there. Maybe it was the FFP sanctions, maybe the club didn't see value in the move, but it's clear that Angelino isn't the gonna fill the void any time soon, if ever.
I'd stick a big bid in for him next summer, purely out of mischief if nothing else; it'd be a difficult one unless they miss out on the top 4.
There aren't many decent leftbacks about; the likes of Gaya are highly regarded, but so was Alberto Moreno and he's been exposed as awful at Liverpool. Id keep an eye on Jordan Amavi at Villa, he's a good player, but the most viable option IMO would be Ben Chilwell at Leicester; the England u20 captain who was superb against us in the Youth Cup semi. The gulf in quality as a proper defender was huge in direct comparison to Angelino, and he earned rave reviews for his performances for the first team in preseason, both as an orthodox leftback and on the left of a back three. Arsenal are monitoring him, and it's only a matter of time before he establishes himself and his value skyrockets, so we should look to get a deal done in January and loan him to the Championship for 6 months to get valuable experience before coming back for preseason.