This guide was very useful to me while in the country - to tell me a bit about what I was looking at, allow me to plan along the way etc. The maps were generally pretty accurate (except for the location of the post office in Hama - it must simply have moved location, 'cause they were way out!)
However, some of the opinions and judgements were highly subjective. This impression was further reinforced when one of the authors announced on the Thorntree forum that she now prefered Homs to Hama - despite a strong feeling the other way being expressed in the current edition. Granted, cities change - but this example does highlight the necessity of going by your own judgement and feeling as much as anything else (I personally love Hama). Of course this is true of any guidebook, but is particularly the case with this one, as I am unimpressed by the bit about the authors in the front. They both seem well travelled and at least have a fondness for Lebanon (Syria doens't get a specific mention, being lumped with the rest of the countries under "middle east"!) but they live in UAE. It seems a great shame that someone with more experience of living in the two countries, and more fondness for Syria, couldn't have written the guide.
This leads to the final criticism - the lumping together of two sometimes very different countries, when each easily warrants its own guidebook.
I would very much like to see an LP guide to Syria, written by someone who has both travelled and lived there. Until then, this guide is helpful but more flawed than even the average travel guide.