You say 'if' but are discussing this with those who *have* bought them. We are telling you what it is that makes us buy them.
Nobody rejects a car because one button isn't very good but a plethora of cheap switches often covered with long textual explanations of what they do reduces the ambience of an interior and cheapens the product. The Infiniti I put 4500 miles on last month was full of this sort of stuff.
I kinda feel a bit for the OP here though as we've moved onto generic Jap v German and I've no idea how the current gen GS compares
I didn't think any of the Audi systems were touch screen (Which is a good thing as touch screen in a car really doesn't work. Guess what the Infiniti had...)
Not one factor alone but it adds to a list of factors. And given that increasingly in cars these days almost everything you do with the car bar actually drive it is through these infotainment interfaces one that sucks can be a constant source of frustration.
I don't deny these people exist. They do. And they are annoying because they are the cause of a market full of Mercedes Benz A160 CDI AMG Sport Mega Plus Ultra AMG SUPER SPORT's with 19 inch rims, chrome trim everywhere ant a 50bhp diesel engine, but despite the existence of these people there exist many German cars where the core product just feels so right in a way that so far Lexus, Infiniti et al have yet to perfect.
The Q50 I had was a perfect example of this. On paper this thing knocked the **** out of the Germans. Fantastic powerful engine. Great handling. Etc etc... but once you lived with it little sources of frustration popped out all the time.
Perhaps we need a Jap v German thread or something so it doesn't sound like we are all hating on Pyscho_Si's new car, which does frankly sound fairly awesome, especially that brilliant powertrain showing that you CAN get power and economy without a diesel engine.