At least he has passion and tries.
That is probably the best thing that can be said about the right back, with his rashness when it comes to tackling and poor positional sense something that will never change.
Louis van Gaal wants a tight back four who can all rely on each other and Rafael is not the man to be a part of this.
Now given enough chances to shine, it is clear that the only thing to do is send him to a lesser Premier League club or La Liga, where his defending would probably be considered world class.