Started as a creak when driving over humps, eventually the hole car shook when stopping or starting

Over the years I have driven a Lexus LS400, then a LS 430. Both were good cars and gave me no trouble. Now I am driving a 2007 LS 460. At only 50,400 miles 6 of the 8 bushings in the front suspension had developed large cracks and needed to be replaced. Very expensive! I am very disappointed. I guess Lexus quality is no longer what it used to be. I definitely will have to re-evaluate my loyalty to the Lexus brand.