A unique choice for "best overall" gets Consumer reports a lot of press coverage and traffic. There's probably not much meaning to "best overall" anyway, and its great for them to pick something flashy and new.
I've lost respect for them since antenna-gate. They often rate Apple's phones the highest while writing articles about their horrible 'flaws'. It feels like two sides of the house aren't talking to each other.
That said, the Model S is supposed to be very nice and is a cool advancement for the industry over 'yet another model year of Civic/Focus/whatever'.
I would disagree - Consumer Reports is easily the most objective independent consumer product review organization that I've ever seen. It's not hypocritical to point out flaws in a product and chastise the company behind it for putting out spin while simultaneously viewing that product as excellent overall, despite its flaws.
One of their big things is holding companies accountable and trying to promote truth in advertising and shame those that violate that trust, so if they see a company spinning as hard as Apple does, they're likely to call them out for it.