i wouldn't totally trust JD Power -
they get their information from owners - great!
who are the majority of cadillac/buick owners? OLD - not so great!
how many of these "older" owners are picky enough about their caddy that they would use up precious time and effort to go to the dealership? - not so much!
hey, i'm sure if a caddy and a BMW both had a high pitch whine from the HVAC, the BMW would be in the shop with a complaining buyer, saying "this isn't the german engineering I paid for", while the caddy buyer would say " wow, these supple heated seats sure are cozy! .......what whistle?"