I just finished "2012 - The War for Souls" by Whitley Strieber. One word can sum up the entire book, disappointment! I had previously read and enjoyed "Communion", "The Greys", and "Majestic", and was interested in his view of the 2012 event. While my imagination can arrive at a wide range of scenarios, parallel worlds inhabited by intelligent reptiles, wanting to terraform our Earth and use humans as slaves...well I never would go there.
I do believe there is probably some ancient explanation for various world wide legends, and folks tales, but this probably isn't it. The parallel world characters were interesting; a few good twists in the plot kept my attention, and I kept reading until the end. I can imagine a film version, with copious special effects, would even be entertaining.