Most people don't know the game existed so im quite sure it probably hasn't been stated but ...
Freelancer
If you have played it, and finished it, you know the disappointment im talking about. If you haven't let me tell you of the game and the "oh shit we're running out of money" ending.
Its an older game that ya navigate space systems, do missions for various factions, very flexible game play with what starts out to be about a mystery object that your given and how the space station you lived on was blown apart for. You have no clues what the thing is and thru the game play you assist the investigator figure out what it is, who blew the space station apart trying to get it and why it was even sought after. when you do figure THAT all out get double crossed by the law and become a fugitive. While being hunted down you find salvation from the very people who destroyed the space station to get the object BUT they want it so that the very unfriendly aliens cant have it. WHY? because it destroys the universe (huge surprise) and the unfriendly aliens are body snatchers! That's right .. aliens that suck your brains out so they can control your body. So you help the people out that nearly killed you from the start on their crusade and destroy the body snatchers from getting the object that would destroy the universe.
20+ hours of completely interesting game play, with in game economics system, random cashes of goods, alien artifacts, bounty contracts, upgrading everything from the guns, navigation and the very ship you fly. The game was network-able .. meaning overly complicated multiplayer that you could work together to explore vast star systems and complete randomly generated missions. Run a "trade house" of sorts, or just be a bounty hunting clan... the things the game offered was boundless yet the ending to what can be called the story basically turns the game into a big pile of sickening crap that you don't even want to play it anymore.