It was good, but it wasn't that good :P. Go to youtube and watch just about anything from the last 10 years by Joe Bonamassa, then get back to me. I realize this will probably start another subjective "who's the best guitarist ever" flame war like in those stupid "top 100 guitarists of all time" threads, but hey - I got my vote in early for Joe B. :).
If you have to ask who the best ever American guitarist is then you have never heard of Johnny Smith. His best recordings were in the 50’s, but here is a recording at a later age.