I read a review recently of Less Than Zero were the reviewer said they felt stressed when they left it unfinished. I know what they mean, and I don't know how Ellis does it. But it's great.
I don't buy into the "why should I care about his characters when he doesn't" bullshit. It takes a hell of a lot of work to make it feel this discarded. His train of thought narrative is exceptional and comedy so dark it'll stain your soul.