I'm finally working my way through it. Glancing at my achievements it looks like this:
Chapter 1: May 2010
Chapter 2: July 2010
Chapter 3: April 2011
Chapter 4: April 2011
Needless to say it didn't really grab me either, however I do like the story, setting and atmosphere(reminds me of Condemned). I think it's the gameplay that is lacking for me. Here, let's take a suspenseful game, have you on the edge of your seat and give you 500 collectibles to find. lol Ooh, a coffee thermos on the side of the road, let me stop and get of my car to grab it. rotfl The shine light and shoot(wash, rinse, repeat) mechanic is okay, but there should really be more to do. The graphics are sorely lacking as well. I know this was originally developed for the xbox and moved over to the 360, and it definitely looks it.