Nothing wrong with scoring from set pieces but the blocking, grappling and holding before a ball is even kicked is out of hand, and it was pretty bad before. Think it looks worse because they are all stood on the goal line too. Hard to give a decision because how do you decide who is fouling who.
Might be effective, and the delivery into the box is very good but it just looks shit. And you no grassroots coaches are going to be trying 'set pieces' rather than technical stuff from a young ages.