well, but I think you can not blame only lexus for it.
For example in my case, I like the change. BMW 520d has now very good pricing here, basically for the same amount I paid for lex I could have this beemer with autobox. If I was buing now, I probably would go for the 5er.
Also, the situation on the market changes. 1 year ago was at the market bloody old A4 and bloody old C-klass. Only 3er was new, but the interior finish is..hm...made from materials ready to be cleaned with the garden water hose - words of my friend :) - it just looks cheap (it looks better if you pay for leather and wood trim)
Now the lex has much thougher position on the market than 1 year ago, no wonder that less people would buy it.
Look at you, you were (are) satisfied with the Audi and anyway you bought different marque...
but don't you think that other marques owners don't have these problems?
I think we are too picky. I hear rattling, I ask my girlfriend, I ask my friends, I drive my dealer - nobody hears it, just me...
Every car rattles a bit. The question is, how noisy/quiet the car is. The quiet rattles in most of the cars dissapear, but in IS it is more difficult, because IS is very silent for a diesel car. No doubt.
And regarding the MPG, I still can not believe how some people here can be stressed about 5mpg.