From the video, and the fact that it made the cut from hours of recording, I got the sense that range anxiety was one of the few heavyweight deciding factors.
I was rather shocked (not necessarily surprised, being journalism) to find out in this thread that you reviewed an EV without a proper power source at home and didn't mention it in the review.
If, like about 99% of Model S owners, you didn't have to think about filling up and always started each day full, how much difference would it make in your opinion?
On the flip-side, if like most people with an S550 who drive like you, you had to pay for the gas at 17mpg without compensation, would that also impact your opinion? I'm going on the assumption that Motor Trend covers the cost of gas for car reviews.
If you factor those in, I don't really see how the S550 comes close to the Model S, even though it is a night club on wheels. I have a feeling the lights will get a little boring after a few months (as pretty lights have always done for me before), really just something to show off and has pretty much zero impact on actual driving experience.
I'm buying Model S because I don't like to waste time and money on gas and maintenance, and I like the flexibility of choice with how cleanly my vehicle is powered and where I fill it up. Also safety and reliability was a major factor, something that turned me away from the Leaf or Focus Electric as a stop-gap car. Just to name a few of very many reasons. Before Tesla, I would have never imagined spending over maybe $30k for a car if I were to buy one new. In fact, I can't recall spending more than $1k on anything other than TSLA stock and my Model S deposit, I'm that crazy about saving money and that crazy about Tesla.
I should say that it is my opinion that Model S is the best car, for me in particular. Given the very many different factors that make a car, it is not very wise to say that a car is the "best" or "better" car outside the context of opinion let alone the target market, especially in a professional review subjected to the public microscope.