I feel bad for Malfoy too. He's only 16, and out of spite, Voldemort puts this HUGE responsibility of killing Dumbledore on his shoulders, not to mention having to fix the cabnit so the Death Eaters can get through to Hogwarts.
Malfoy was proud at first to be given such "an honor," but obviously it began to wear on him, crying at least twice (though we only witness it once) and looking tired and worried all the time. Poor kid.

But AHHH! I really HOPE that Snape is somehow pulling everyone's leg, and is really a good guy, but like I said, he wouldn't look at DUmble with a intense expression of "HATRED" if he wasn't evil. Anger, maybe, but not hatred.