What do YOU think?
It occurs to me that your original question has not been answered - at least by me. It's actually an interesting question if you take the politics out of it. When you de-demonize him, Bill Clinton is an extremely intelligent man. He understands law, and has pretty good analytical skills. Leaving aside moral and legal issues that would rule him out as a good
nominee, I think Clinton would have the ability to be a good SCJ. Where Bill's own selfish interests are not involved, I think he couldbe objective and give strong consideration to the legal merits of individual cases. I think the law, politics and history are fascinating subjects to Bill (even more than most politicians). So I suspect he would have a strong respect for the concept of common law and be able to make dispassionate decisions when faced with thorny issues. On the other hand, being quite intelligent and analytical, he might well have difficulty making decisions where there is no clear course. Then the politics would kick in. That is, however, not unlike many - probably most - Justices who sit or have sat on the court.
As to the cons, I am not certain that he could rise above partisan politics in making final decisions, and I am sure that appointing him to the court while his wife holds the Oval Office would be an extreme conflict of interest. Finally, given his very high opinion of himself, I am not sure he could play well with the others on the court in conference. It might be quite difficult for him to negotiate and compromise with others once the weight of his own legal opinion had been soldified. Bill showed a capacity to adapt in the Oval Office, and maybe he could in the SCOTUS, but the court does not require the sort of give-and-take that the Executive office does. Congress (controlled by the Republicans for a large part of his Presidency) had the ability to push back hard against him. Even the Chief Justice would have little power to do so in the SCOTUS. Clinton clearly has a petulant side, and I could see him digging in his heels and closing his mind when his ego was at stake.
So bottom line is, I think Bill has some potential to be a good SCJ, but I don't see him as ever being nominated or confirmed if he was. In the long run, that's probably a good thing. I might well want to read Bill Clinton's opinions on legal decisions or historical issues. I suspect they would be a good read, but he would be a better pundit than judge.