He has plenty of good crosses. United are just awful in offence, simply awful. No more than 2 players inside the box at a time and the build-up is so slow that when he manages to get into a crossing position the opposition has 5-6 players inside the box ready to head the ball away.
United is probably the worst team in the league in the air. Our biggest players can head the ball away but Smalling and Fellaini are poor inside the opposition box. Unless you pass exactly where Fellaini is he won't do anything and Smalling is just not good at heading the ball.
Rojo's mistakes have been highlighted more than anyone's and it doesn't help that people think that "all Argentinians playing for United are rubbish" hoodoo that people believe. We've had to deal with ridiculous injuries in defense as you well know and our left half has been filled with makeshift players. Both Blind and Rojo have had to fill in a position that isn't their strongest and overall have done well as a unit. Our main culprits have been our attackers but like the defense they've also been shifted all over the place in numerous formations.
I'm not gonna get on the Rojo hate train because he's been no worse than Rooney, Herrera, Lingard, Mata, Darmian, Schneiderlin, Carrick...basically everyone's been worse overall than Smalling, Blind, De Gea and Martial. That's the state of our team at the moment and I'm going to reserve my judgement until a new managers deals with the players. If he cuts anyone of them I won't go mental but it won't be surprising if he doesn't either.