Nosrati is one of the best defenders we have in Iran. He is very smart, and fast, compared to other defenders we have. he is not as quick and doesn't have good touch on the ball, but hey, this is Iran we are talking about. Complete players are very very rare..
You want proof, well name a central defender who can play LB as well as Nosrati does. (not saying Nosrati is a great LB, but he is adequate)..