Blake comments that Disraeli "produced an epic poem, unbelievably bad, and a five-act blank verse tragedy, if possible worse. Further he wrote a discourse on political theory and a political biography, the "Life of Lord George Bentinck", which is excellent ... remarkably fair and accurate." But it is on his novels that Disraeli's literary achievements are generally judged. They have from the outset divided critical opinion. The writer R. W. Stewart observed that there have always been two criteria for judging Disraeli's novels—one political and the other artistic. The critic Robert O'Kell, concurring, writes, "It is after all, even if you are a Tory of the staunchest blue, impossible to make Disraeli into a first-rate novelist. And it is equally impossible, no matter how much you deplore the extravagances and improprieties of his works, to make him into an insignificant one."