Chyna was a larger than life icon who should've never done porn ... that's according to one of her co-stars Lisa Ann ... who says the bang biz was too dark a place for the late WWE star.
FYI, Lisa Ann starred in the XXX movie "Chyna Is Queen Of The Ring" back in 2012 ... and Lisa says her heart sank as soon as she saw the WWE legend on set.
"Porn wasn't an element for her, she was so much bigger than us ... it's a bottom feeding situation where people will take advantage of people when they're weak.