I posted this list not quite five years ago, noting that Dombey and Son (1846-1848) was omitted from the complete list of Dickens novels since I hadn't yet read it. As of today, though, I would elevate Tale of Two Cities to the Greater Seven and demote Little Dorrit to the Lesser. I omit Drood; after all, it is unfinished. Having read Dombey, I would put it with the Lesser books. I would tentatively also elevate The Old Curiosity Shop to the upper group, for a new Greater Seven. It's not usually considered one of his best and yet it seems to stick in my thoughts as having got under my skin.
Greater Seven:
Martin Chuzzlewit (1843-1844)
David Copperfield (1849-1850)
Bleak House (1852-1853)
Little Dorrit (1855-1857)
Great Expectations (1860-1861)
Our Mutual Friend (1864-1865)
Edwin Drood (1870)
Lesser Seven:
Pickwick Papers (1836-1837)
Oliver Twist (1837-1839)
Nicholas Nickleby (1838-1839)
The Old Curiosity Shop (1840-1841)
Barnaby Rudge (1841)
Hard Times (1854)
A Tale of Two Cities (1859)
REVISED:
Greater Seven:
The Old Curiosity Shop (1840-1841)*
Martin Chuzzlewit (1843-1844)
David Copperfield (1849-1850)*
Bleak House (1852-1853)*
A Tale of Two Cities (1859)*
Great Expectations (1860-1861)*
Our Mutual Friend (1864-1865)*
Lesser Seven:
Pickwick Papers (1836-1837)
Oliver Twist (1837-1839)*
Nicholas Nickleby (1838-1839)
Barnaby Rudge (1841)
Dombey and Son (1846-1848)
Little Dorrit (1855-1857)*
Hard Times (1854)
An asterisk (*) indicates novels I have read more than once.
Note that, again, I haven't attempted to rank favorites other than what's implied by putting a novel in one or the other of the two groupings. The novels are listed in chronological order.
I have just finished a second reading of Little Dorrit. This is an impressive novel, no doubt one of the greatest of the century, but yet Orwell's comment that it is "a dull book in a way” seems fair much of the time. The two protagonists, Amy Dorrit and Arthur Clennam, are admirable people, but only an author with particular gifts could probably make them a great pleasure to read about. (It is said that, for example, Charles Williams was unusually gifted in the portrayal of very good people.) Arthur's bitter old mother is a bit of a Miss Havisham, but mentioning her is to throw Mrs. Clennam greatly into the shade. The villainous Rigaud is just too stagey even for Dickens, who so often can create great literary "theater." It's not a big deal, but Dickens seems to have no idea about what Doyce's great invention is. Flora Casby eventually became tedious rather than funny. So my view is that Little Dorrit is not a failure, but it is a much less winsome novel than usual for Dickens. It shouldn't be the first, nay shouldn't be the sixth, novel of his that you read.
I started a second reading of Hard Times some months ago and confess, for what my experience is worth, that it didn't hold my interest. Being much the shortest of Dickens's novels, and possibly known as being regarded by F. R. Leavis as a masterpiece, it might be the Dickens novel that someone would pick first to give him a try. Someone else's experience might be better than mine! But I fear that that would be a mistake.
Clearly I favor the later novels, but I acknowledge that there are readers -- I believe Chesterton was one -- who favored the earlier ones. I will probably start a second reading of Nicholas Nickleby or Martin Chuzzlewit before long. I've already put the latter in with the greater ones. If I feel that Nickleby belongs with the greater books, my neat 7 + 7 arrangement might have to be let go.