There is a remarkable amount of disinformation that is spread around about this plane. My father (who is ex-Air Force) assumes it is because it is so far beyond what "opposing" forces can field they will do anything to delay its operation. I don't know where it comes from but I do not that the relative transparency of the US procurement process makes it easy to talk about problems which are later addressed and never return. You can compare that to a more secretive system where all of the kinks are worked out behind the curtain and the end product is presented ready to fly. It "feels" better from a marketing sense but I haven't read anything that suggests the Russians or the Chinese have any fewer issues when they build a bunch of new technology into a plane, it just gets reported on less.