Yes, it is if you are an out-of-towner. There is no Caltrain stop at the airport. You have to figure out BART and then figure out Caltrain. The shared van shuttle to MV sucks too ... especially if there are any Stanford students on board. On some days, the line up for rental cars is insanely huge. Plus, the rental car depot is at the far end of the airport. If one values their time, taking the $120 cab to MV isn't that big of a deal.