The problems you have had "are" niggles. Admittedly annoying, but nothing major.
As for lexus losing reputation, not really there are very few cars having problems.
Are they still better than the germans yes.
My old C class was brand new and that went back so many times, friend works for Audi and would sees loads of new A4/6/8's coming in every day.
They are juts made on the cheap now.