Neither "free" nor "open" guarantees quality, though there seems to be some perception that it will in some way lead to that. Here's a quote from the FlightGear site:
Quote:
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Originally Posted by FlightGear
FlightGear is a free flight simulator project. It is being developed through the gracious contributions of source code and spare time by many talented people from around the globe. Among the many goals of this project are the quest to minimize short cuts and "do things right", the quest to learn and advance knowledge, and the quest to have better toys to play with.
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Download that for free, and buy MS Flight Simulator, and compare them for yourself. Of course, you'll need one of your machines to be running Windows....