I also listened to him ten years ago. Every week or two I'd pick a new channel to watch to death while working, so I've probably consumed 40+ hours of content.
I heard bits and pieces over the years since that gave me the same reaction - what the hell happened. Although in retrospect the seeds were probably there even back then.
One thing that came out later was him emotionally explaining to the camera that the problem with the world is that women choose assholes to date. Another was his violent fantasy about what he'd do to his mother. That these kinds of outbursts didn't lose him his audience pretty much tells you all you need to know.
It's a shame, as there were a few pieces that stuck with me from when I watched it that I think made me a better person.
It was the first time I'd personally been exposed to ideas (mainly because I was young) like never hit children, it's OK to cut contact with an abusive family, that circumcision on babies is wrong and that you should structure your life to spend a great deal of time with your children if you want to be a parent. They've all pretty much stuck with me until today.
Plus a bunch of interesting in theory libertarian stuff, although I'm so far away from many of his positions it's almost comical (I'm the kind of person that wants high income and capital gains taxes and 100% inheritance taxes to fund a basic income), I find it a good diff on current society.
It's a shame, because if he had progressed towards cuddly-bear Molyneux instead of I-want-to-run-a-cult Molyneux, I think he could have been a positive force instead of the target of what is a pretty well justified ban today.