I think it is ridiculous that a rank amateur demeans an IM title.
Try obtaining one. Even with all so called the rating inflation and increase in titled player, an IM (or even FM) is a very impressive achievement. Josh was a very strong player--perhaps not world class but very strong. He left for other interest. But to say he has little or no talent because he only reached IM status is a horrible mis-truth.
Burn out is common among many talented juniors in many fields--not just chess. Josh was a class act as a player and a very strong and talented player as well.
Josh Waitzkin never blamed his leaving chess on Dvoretsky. He mentioned Dvoretsky in his book "The Art of Learning" to make the point that when teaching you should not give cookie cutter instructions to the pupil but rather a teacher should tailor the instruction to fit the needs and style of the student. Dvoretsky was trying to get Waitzkin to think and play in a way that didn't suit Waitzkin's style and so in the book he said it essentially didn't help him to have this kind of teacher. That's all. Waitzkin threw heaps of praise on the other chess coaches in his life and said the reason he left chess was because the fame from "Searching For Bobby Fischer" changed the intimacy he had with the game and the new public expectations and distractions separated him from his love of chess.