It's often the ones who live in the Premier League bubble and haven't seen these players at previous clubs who come with misguided 'not good enough' comments. Happened with Blind last season, when he was being written off even before we signed him without taking his performances for Ajax and Holland into consideration. Is happening now with Darmian who was wonderful at Torino before he signed for United. Matteo will be fine in the medium to long run, Van Gaal's 'system' or method or whatever you wanna call it - is notoriously harsh on newer players and there's a substantial growth learning before they start clicking. Right now he is worrying about positioning and ball movement (two keys for Louis' fullbacks), and that can be mentally taxing as players go against their natural instinct, and what they've learnt under previous managers - hence the circumspect playing style (as players play within themselves instead of doing things organically) and positional errors; but soon enough he'll get a hang of the whole thing, and start playing with automatism. This is how new players have historically performed under Van Gaal, and Darmian is not an exception to the norm.
As for your "Premier League bubble" logic, it may as well go the other way; there´s a long line of players United has signed from sides as good or better than Torino who haven´t made in the Premier league. I see you conveniently don´t mention them. And don´t compare Darmian to Blind. Anyone who wrote Blind off from last year is a football genius clown, which sounds like you would agree with.
I also don´t get, just because Blind came good, it means Darmian will. It doesn´t. You use Blind as an argument, but then again you can use as a counter argument any player who started off well and turned to crap. There are thousands of examples. You might as well use one of them, it would be just as valid as using the Blind example.
I just don´t see how Darmian is suddenly going to change. He´s never going to take defenders on, and beat them. It´s not going to magically happen. His understanding with the wingers seems to be getting worse. He looks slow, lost and lethargic going forward and our wingers seem to ignore him. Even Valencia, with only one foot, is far more technically astute, and a much better passer and makes great runs (albeit with a less than satisfying final product). The same can be said for Young. In these days of United´s poor offensive form, Darmian seems much more symbolic of it than any kind of solution to it. It´s mad to bitch about our offense, and then turn around and want Darmian to be at right back.
He´s not suddenly going to be graced with pace to keep up with these quick PL wingers who continually skin him. Besides his good one on one play, where is there anything else laudable, or the potential for this guy to get better? This is not Torino. This is not Serie A, nor international play. Some pointed out he was "good" and "decent" last Wednesday, but this of course was against a toothless PSV playing at Old Trafford. This is when Darmian seems to "shine" as decent. But back in Holland, with a more lively PSV, they killed him, and he was at fault for both goals. Opposing managers haven obviously taken notice. Rainieri has probably creampt in his drawers thinking about putting Jamie Vardy up against this guy. I can´t imagine LVG would let this happen to this supposed "natural fullback and great defender."
I also hate the fact that when he plays and we are chasing the match, LVG must always substitute him. Why are we having to waste a substitution on a right back when we´re needing a goal? This guy was gifted the right back position. It was his for the taking with all the wanky bandwagon support he could ever want, and by mid season he has fallen back to second choice behind Ashley Young. Ashley Young!!! I said before, with a healthy Valencia (not to mention Shaw), Darmian would not even be on the subs bench. What would be the point?
I don´t dislike the guy personally, and would certainly never call him stupid or a coward or question is footballing brain, but this guy is not good enough for the PL (well, maybe for Stoke), and the bandwagon created for such a bang average fullback has been a joke, and one that seems difficult to disappear. People keep wanting to compare him with Evra´s poor start, but Evra was never even near this poor, and the potential was obvious as he took an excellent Gabby Heinze´s place