I am considering buying either a late model ML 320 or a Nissan Pathfinder 4x4. Either one I pick will be about 1-2 years old with low miles. My question is this...is there any substantial concern over reliability on the MBZ? Consumer reports gives the 320 a poor rating but they did not go into detail. The pathfinder is rated well, but I like the 320 in most respects. Can anyone give me some good advice? I am planning on keeping this vehicle a long time and putting a lot of miles on it. Thanks!!