A work collegue has had the head gasket and two water pumps in 60k on his Lexus.
I think you hear less about their problems as they deal with them efficiently and there are not many of them on the roads compared to other brands.
From all reports Lexus have their own problems but the owners are provided with more goodwill gestures than most other marques....resulting in the "problem" customers not shouting so loud in public...