Don't feel bad, I'm a HUGE fan of sarcasm and the Unofficial Guide just eats at me.
It brings in politics where they shouldn't be and takes way to many shots at the company, and the average guest whenever it can. It is almost a "talk you out of going" guide. Maybe if they wern't trying to be the "rebel" guide so much, I'd like it more.
That and it WAY overpushes the tour guide thing -- with a must have and jadded point of view. I don't personally get tour guides AT ALL. I have never felt that a book written 9 months ago could predict what a Tusday afternoon line would look like for the Jungle Cruise. The book makes it sound like that by not following their advice you will have a terrible trip. They also put down lots of things that a lot of people really enjoy.
The one thing about all these guidebooks is that it isn't much more information than Disney already gives you. Almost ALL hold the exact same info. Passport has the Pix that most don't and that's really great for making you feel like you have something you can really relate too. The Official Guide is really slim in details (Alfredos in Italy has Italian food).
Like others have said, take about 2 hrs to sit at a B&N and thumb through 5-6 of them and see what you like. Read about resorts you want to stay in or have been to before and see if it's giving you the detail that you want with the "attitude" you want.