It's a force multiplier. The pilots we have had reports from who have driven the F-35 think that it is a superb aircraft because in addition to stealth it has a fusion capability, which takes the data flow from all of the sensors and integrates it such that the pilot is totally aware of his combat environment. Purely as a non-stealth fighter aircraft, it's an extremely effective aircraft.
On February 9th, 2012. See this statement in context.