It’s no wonder he took all that anger out on Harry, especially after that scandalous point reconfiguration for the House Cup their first year!
It’s worth considering what Draco would have been capable of had his parents not been Death Eaters, as well as generally awful people.
Of course, that immense pressure may have been a driving factor for Draco to be as skilled as he was in some of his studies, even if it was only an effort to get the love and approval that his parents would never fully grant him.