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Mauzindark
It seems as if you're taking the "grass is greener on the other side" approach. You mention someone like Garay being better than Evans, but Luisao, a world class and underrated defender, takes care of so many of Garay's weaknesses. Plus, their partnership has lasted a longer time than many of Evans' defensive partnerships. More often than not, Evans has had to deal with changing central defenders, defensively-weak left backs, and defensively-inept central midfielders. Did Garay have to deal with those?
I feel as if Evans is at a fairly high level. I mean, he's faced the likes of Drogba, Ibrahimovic, etc., at his younger ages and coped well with all of them.
If he had the qualities you suggested, Sir Alex would have sold him a long time ago, and I would have preferred a replacement, myself. However, he's been here for more than 5 years, already. I doubt that, if he was as bad as you say him to be, he would have stayed here for this long. You know that Sir Alex likes solid, dependable defenders, and he would do anything to get them for the present and the future.
I, pretty much, share the same views as LR7. He doesn't have many weaknesses in his game like he used to. His main problem is that his man-marking isn't the best, and I think it's because he doesn't have the defensive instincts of Smalling, Jones, Thiago Silva, Hummels, etc. In 1-on-1 situations, I've seen Smalling and Jones do a better man-marking job than Evans, but Evans is still a decent man-marker, no doubt about that, given how he has done well against the names I mentioned, above. His positioning, in the box, is also pretty good when our defence is settled. However, any defender would struggle to take good positions when facing counter-attacks, particularly when others aren't offering much protection.
I don't think Evans will be up there with the best, but he'll certainly be a useful defender for us and one who can seal the first-team spot, here, if he irons out more of his weaknesses (man-marking, positioning in the box).