Stand by what I said earlier, think Mulgrew's general crossing is decent, whether that be in play or corner kicks. You can't realistically expect every corner kick to lead to a goal or a chance otherwise he wouldn't be playing for AFC.
I presume you mean Harts general crossing, I do remember one game inparticular at Dundee Utd where Hart was given so much space and couldn't cross worth a feck. That said don't mind him taking corners much?