If you're into the whole "guitar legend books", you might want to learn from someone that plays the style you wish to play.
It's all about keeping you interested in learning from the instructor.
Let's take guitartricks for example. Each instructor has it`s own style and approach to teaching. Some have very classical oriented lessons with songs to learn from, while others have a very practical approach and give you tons of tricks, a more hands-on approach if I may say so.
It's all about finding the right type of teaching and style.
