I had the same reaction to this as I did to V for Vendetta. It’s a bunch of political propaganda dressed up as entertainment. However, that said, it wasn’t so didactic that it turned me off. It also has insighful things to say on a topic we’ve all heard discussed to death (i.e., terrorism and the Iraq war).
There were a few things that were a bit far fetched too. (For example, how did Baxter find Henry’s house?) Entertaining, glad I read it, but I probably won’t run out and get his next book right off the presses.