"I - so what if I did?" said Harry.
"So, Dirk Cresswell is ten times the wizard you are," said Mr Weasley quietly, as the lift sank ever lower. "And if he survives Azkaban, you'll have to answer to him, not to mention his wife, his sons and his friends -"
Harry Potter and the Deathly Hallows
What's "ten times the wizard you are" supposed to mean?