Well to be perfectly frank I don't rate him as a wide forward, I didn't want him in Jan and still don't. He can't beat a man, he doesn't dribble, his skills are finishing, runs and playing a pass. Which is pretty much the same skillset as all our other 'wide forwards'. If we had Mane on one wing and Sanchez on the other I'd be fine, but having two wide players that can't create width is a problem.
You're being very generous if last season he was knackered when he couldn't beat a man to save his life, and this season he's looking great.. in pre-season friendlies.
Look he is a good player and I do hope he plays well for us, but it's a fact the he's 29 and seldom ever dribbles with the ball, which is what our team is crying out for. Look at the other teams - Sterling/Sane, Mane/Salah, Hazard - all of these can provide width and beat a man. I don't dislike Sanchez but the reason I say we're stuck with him on the wing is because none of our wide forwards can beat a man consistently, all of the prefer getting the ball to feet and playing a pass. If we signed Mahrez for example then I'd be very happy with Mahrez and Sanchez as a wide pair as one can dribble and stretch, but currently we're stuck with Sanchez and Lingard as a pair and it's just seriously way off what's needed for a top team.