I sincerely hope I don't sound full of myself when I say this, but I've yet to find an instructional dvd that teaches me something that I haven't already learned through my 3 years of experience with guitar.
I've found that just listening to music and copying the sounds I hear as closely as possible has given me
the skills that I wanted without ever having to do scales or any other excercises.
But different people have different ways of learning