If we want the cold numbers, then SquareTrade - an independent company dealing in extended warranties - estimated the failure rates of PS3 in 2008 at about 3%.
Since that's an average that includes early 60GB models that had a higher failure rate due to the overheating (it had extra chips for BC and SSD interface, its CPU and GPU were larger and more power-hungry), by buying a new PS3 today you're going to have a product with a way lower likeness of failing. Someone talks about "less than 1%" but I can't give references for the source.







