NOT a Porsche owner, but having a 1987 Benz 560SL more than qualifies me to chime in.
I think forums give a skewed look at the truth. Most people, whether it be cars, customer service, etc., tend to only report bad news. Few people create a posting just to tout that their vehicle has performed in a reliable way. I think with both older Benz, Porsche and BMW the old adage applies: you get what you pay for.