Outside of Arnold, Mike Mentzer is the most talked about bodybuilder ever. At his peak he was making insane money for the time. When I was a teen he was first breaking on the scene. Since I ate up everything Arthur Jones wrote I was more than intrigued with everything that Mentzer wrote. I use to tear out everything he wrote and kept it in a file. I still might have the most complete Mike Mentzer collection of his writings anywhere.
Do I still believe super low sets and training to failure for every set to be the magical road to bodybuilding nivarna. No, I don't. It is a tool like many in the bodybuilding tool box. In bodybuilding we don't have facts. We have theories. You can't argue a theory is a fact. If we had facts we would all be training exactly alike in terms of sets, frequency and exercise selection.