Yes, Verker's run was outstanding. How he did it it's beyond me. He did NOTHING apart from that 2 weeks. He's gotta be the weakest grand slam finalist in the open era.
His capabilities certainly weren't weak, but I understand what you mean. He had been incredibly injury prone before and after Roland Garros 2003 along with motivational issues. He managed to bag a couple of ATP titles during his short spell on tour.