I've owned two MB's. There are some things that I like. They are definitely well-built with excellent materials. Also, thanks to the autobahn, Germans place emphasis on large, comfortable cars that have a lot of power and handle well. If not for the Germans, I doubt a car like the G8 would even exist.
But, German cars are way too complicated. In some instances, they are complicated for the sake of complexity -- in fact, complexity is part of their marketing theme. The ones I've owned were V-8's. Huge, complex, overhead cam aluminum mills that liked to skip teeth on timing chains and self-destruct. Don't even get me started on the expense of repair parts, the lack of mechanics that could competently fix the cars, and how much those incompetent mechanics thought they were worth. Auto transmission on a German car?? Forget it (should have gone manual -- but wife's car). Electronics on a German car?? Precisely engineered to last for the warranty period.
American and Japanese cars are MUCH better for the long haul. And, you gotta love the compactness, simplicity, reliability and power of a good ol' big-cube, pushrod, torquemonster all-American V-8. The electronics just work -- even 30 years down the road. The transmissions work too (especially with a tune).
Now to go off topic. I thank God that German engineers are the way they are. If it weren't for their penchant for complexity, WWII might have come out differently. However, you have to understand that it is a national characteristic. Given the choice between a complex solution vs. a simple, functional solution, the German engineer will go complex every time. Initially, you'll love the complexity. In the end, you'll rue it.
Back on topic, as long as you're under warranty, it should be an OK experience. But, if you like keeping your cars longer term, history says that a Pontiac will be working a lot better and be much cheaper to keep up 10 years down the road than a Bimmer, especially since Bimmers these days try to out-tech MB.
These are my experiences and opinions. YMMV.
'09 GT, Vararaam, Kooks Mids + GXP Muffs, Cortex 91, Enkei PF01+Michelin Pilot SS (43lbs per corner!!)