I'm about halfway through reading skimming it. It's funny stuff and has a definite flow.
Phase 1: Is it or isn't it all a dream, and other partial variations of the same question.
Phase 2: disappointment over how the dreams aren't weird enough and that this isn't a nonsensical David Lynch film, and the response thanking god it's not
Phase 3: A long and ongoing comparison to Shutter Island of all films (I guess that hot at the time). That part is especially funny to me in hindsight since nobody talks, or seemingly thinks, about Shutter Island anymore. And yet reading the discussion you might get the impression it's every bit Inception's equal, if not the very benchmark of that type movie!
Phase 4: the discussion dives back into little details about gravity and timing and who's what where.
Phase 5: a mishmash of film/director comparisons and their validity/invalidity (Nolan/Kubrick, Nolan/Hitchcock, Nolan/Scorsese...)
Interspersed amongst it all are various out-sourced opinions, and blog links to off-site reviews.
Some good points are made all around, amidst the typical misunderstanding and arguments which always result from the subjective being expressed objectively.
Edit: I was surprised at my own luke-warm reaction at the time. It's grown greatly over the years. Watched it again last night... it's probably top 10 all-time at this point. It just took 10 years to get there, and umpteen viewings.