It's his best novel. Dostoevsky is not for everyone, and you have to get used to his writing, but he is absolutely genius. You just have to go with the flow, and new worlds will open before you.
Finished it up last night and overall I really liked it in spite of my complaints. You're right, he was a genius. I can't think of many authors that are better at setting a scene. It just gets a little tedious to me.
I actually preferred Crime and Punishment to the Brothers Karamazov. The Gambler is next on my Dostoevsky list, but it will be a while. I need to get in a few mindless indulgences first.