Agreed. We have a JB X3 in the family, after nearly 3 years, I have pretty much given up on it. Last summer I was good about washing it (*very carefully*) every week or two, from the time I corrected the paint to 95% in mid June to the end of August there was plenty of swirls and marring. At this point I just have my mom run it through the touchless once every few weeks (end of lease coming in March, thank God). Not even worth my time. :ignore
My neighbor has a (IIRC) Crimson Red 330xi that I washed exclusively for her after its big spring detail this year, and it, too, seems to get marred up pretty easily, even with carefull washes.
On the other hand, my father drives an X5 in Steel Grey, I haven't corrected the paint in over a year (15k miles in that time), washes every few weeks, and marring is minimal. Definitely needs a mild polishing, but for the most part it still looks great. :woot:
Bottom line, you will regret buying pretty much any darker, non-metallic Bimmer.