Yes, I read it this morning. It's in the Weekend Journal section of today's WSJ, page W14.. you can still get your own copy at the newsstand.

The WSJ has very good and well written articles, including the ones on cars; they are rarely mistaken. They are probably the highest ranked and best regarded money-related newspaper in the world.. and they are usually right on the money!

I don't see the article as negative toward MB, instead, they are describing overall usual concerns, from an owner perspective. The author is right about the hesitation at take off from MB, I have had the same experience before with Mercedes engines so nothing new here... The 7G-tronic concern and test is quite valid, and I was surprised, as probably he was surprised too about driving over bad roads, being that it is a very smooth sedan, he probably expected it to be completely smooth like driving on air, which is not.
The article is also impressed by the overall car presence and stance, "long, sloping hood, high haunches and wide stance give it a solid, muscular look", even though it wouldn't be described as pretty as they would call the rivals from Audi and Jaguar (as he states on the backseat driver insert).
The concern about price on a nicely equipped S550 is very reasonable, the options on his test car made the overall price: $105,045 putting it in Maserati territory..... yet another concern that they may loose some sale-grounds if they keep raising the price...

Overall I read a good article, a 'down-to-earth' check up and probably good for prospective buyers so they see what they will get for 100grand..