@Didymos Thomas,
The Brother's Karamazov needs to be regarded with achievements like Hamlet, or Beethoven's 9th Symphony, etc. It's the greatest masterpiece of a
mature genius: peerless, patient, and in complete control of his expression.
It's an interesting contrast with his
Notes from Underground, which was Dostoyevsky's first truly great novel. Underground is only 140 pages, it's one of the seminal works of modern thought, and a mind-blowing illustration of the "modern" man. The nameless main character stands in such brutal contrast to the rationalist ideal of every thinker since Descartes, and this character is far more plausible. It embodies what Freud and Jung tried to understand analytically, and it presages the stream of consciousness in the main body of modernism (authors like James Joyce and William Faulkner and others). It's another must-read. The first 40 pages are a dizzying philosophical rant by the Underground Man, and the next 100 pages are an account of a day in his life.
You can see how sort of impetuous Dostoyevsky was with Underground as compared with
Karamazov --
Underground is just as brilliant, but it's also much more lean, it's more like a big short story that explodes what will end up being a mere facet of
Karamazov. And the other two great novels,
The Idiot and
Crime and Punishment work towards the mastery that he achieves in
Karamazov.