"Now, there are (if I can speak in hushed tones for a moment) those who do not like Dickens at all. There are some who look askance at the buffoonery and high spirits and wish for something more refined. 'If those people are ever refined it will be by fire' is Chesterton’s response, but he does acknowledge that Dickens poses some special problems for modern critics. There is something in his writing that is out of temper with our times, a sense that a critical apparatus which can seize upon Thackeray or Eliot with a firm grip will somehow slip and grasp emptiness when applied to Dickens. Chesterton noted this already a century ago, and ascribed it to the powerful simplicity of Dickens’ genius:
Dickens has greatly suffered with the critics precisely through this stunning simplicity in his best work. The critic is called upon to describe his sensations while enjoying Mantalini and Micawber, and he can no more describe them than he can describe a blow in the face. Thus Dickens, in this self-conscious, analytical and descriptive age, loses both ways. He is doubly unfitted for the best modern criticism. His bad work is below that criticism. His good work is above it."
Craig Burrell, "On Dickens," All Manner of Thing
(Go read the whole thing! It's a very long post, but well worthwhile!)