I like Blind, he is one of my favourite players in the squad, and I am one of few people who defended him a lot last season, but I think people are overrating him as a CB just because of his ability on the ball. I think it simply isn't enough, because he simply doesn't have the body(no homo) for a defender, and he is too slow.
IMO, he is better midfielder and a LB/LWB than a CB. Having him as a defender is good against shit sides who you dominate for 90 minutes, but we aren't doing that often enough so that's why I think we shouldn't rely on him there in the future. Saying that, I still like him more than both Jones and Rojo. I think Jones is better CB in general, but he simply isn't reliable. And I would have Blind in the side always because he is simply very good player, but not as a CB all the time.
I am quite sure our defence will be poor now that we are missing Smalling who meant Blind a lot, even if our other first choice defenders/fullbacks return to starting XI.