Are people actually complaining that he scored the penalty?
He scored, that is all that matters. Moaning that he may not score a penalty one day is prime moaning for moaning sake.
On general player comments, I just love the fact that he keeps possession in such tight circumstances. He is the master of the 'the ball is glued to his foot' technique. This is why he is better out wide as he can also move their players over to double up, etc. and then in the next instance is in free space.
Both him and Grealish do need to mix up their play a bit more though, when on the edge of the penalty area, go on the outside a bit more. Get the opposition thinking, at the moment I think that they are telegraphing the inside move a bit too much.