Many of my students have asked the same question. I direct them to his recorded body of work. Unforunately, alot of the stuff on Youtube was filmed when Jaco was in the throws of his illness, so "judging" him by that footage is unfair. It's imoportant for the un-initiated to not only check out his music, but to learn about his true genius, and his later, tragic plight with mental illness. Watching some of the Youtube stuff, and then forming an opinion, would be like judging Muhammad Ali based on footage of him playfully throwing punches at the interviewer while overcome by Parkinsons, rather than seeing him in his prime. Jaco's prime has been documented on many a recording. Go check it out.
