I would highly, highly suggest you finish it, it gets much better as it goes on, and is more actively engaging. You are totally hitting on very good points that are thoroughly interrogated throughout the entire novel. I think what I get from DFW is less of a compartmentalization of the various states, but a fluidity and equivocation amongst them. Addiction gathers all of this as a focal point because of the addiction is a universal state, a process which everyone is undergoing (in the novel), and being treated for. There are rituals, rote practice, un- awareness, over-awareness as manifested by an addictive state of being. While it is handy to not read as cases from the DSM, I will probably keep this in mind whenever I re-read it, there are plenty of things lost on me the first go-round.