> tedious, sermonizing, simplistic and unconvincing
Astonishing. You weren't able to finish a long, wordy book describing a philosophy you don't agree with?
> She could have distilled her viewpoint into a couple of paragraphs
Wow, you mean as she did plenty of times, which you can easily find by doing a cursory search?
The idea that you shouldn't support your central thesis with as much evidence as you can muster is faintly preposterous.
I don't find Marx to be subtle or complex. I think his viewpoint can be summed up in one sentence, "From each according to ability, to each according to need." Nevertheless, I don't begrudge him writing many giant volumes of "tedious, sermonizing, simplistic, and unconvincing" supporting text.
Atlas Shrugged wasn't supposed to be subtle or reflect complex realities or any other thing you imagine is a requirement for being a great novel. It was written to express Ayn Rand's philosophy and obviously was hugely successful at doing so.