I've wash mine at least 2 times a week and haven't noticed anything. I think there was a thread on what people don't like about their MP5's...
but I didn't post in it, so...
It could use more power.
(I've driven a C5 Corvette and felt that it needs more power as well)
I miss the heated mirrors and true intermittent wipers of my Ford Contour.
(That's about all I miss)
My driver's side floor mat needs to be fastened down, there's a hole in the mat but no way to fasten it down.
I wish all of the power window switches were illuminated.
I think that's it.