I remember some older scenes had underwhelming cumshots but he got better later on.
He's also short; 5'7" so in heels some girls are actually taller than him in some scenes.
Mandingo actually did have a clips4sale store but it looks like he deleted it. Unless someone bought stuff from there it's lost media now.
Video quality wasn't great from the previews I remember and it was before self-content platforms became more popular so he was ahead of his time but didn't stay around long enough to get richer.
Unlike a lot of male performers I never read anything bad about his personality so girls who worked with him felt comfortable and had nice things to say.
I think he officially retired in 2018 but some scenes that year were still being released in 2019 and some vault scenes shot years ago finally released during the lockdowns.