I used to be in AAA and I used their sservices for maps and stuff and enjoyed the discounts on hotels. But that was almost 20 years ago. Now you can get much better rates online so I don't think it is worth it. And google maps is better than AAA I think. Yes, the books are good but teh same information is available online now.
The roadside assistance is worthless. Most people already have that through a credit card, insurance or other membership. It does not PAY for any help you need, they simply help you get the car to a shop. Many shops will even do that for free.
If you do a lot of traveling you will probably save the money in the hotel discounts but otherwise you can get everything they offer for free without joining.
I just think they are an organization that has outlived its usefulness.