Dust 514 was a really, really cool idea that was dead on arrival because CCP (the company behind Eve) released it on a platform that was nearing the end of its lifecycle, and refused to release it on any other platform. It also had to introduce the Dust players to a fair number of the Eve mechanics, particularly around loadouts (fittings) and the economy.
The fact that the spaceship game was intertwined with the team-based FPS was really cool. FPS players (on planets) could be in the same clan/guild/corp as the spaceship pilots, and could call in airstrikes. In the spaceship game, your corpmates could maneuver into position and rain down lasers. This interaction had an effect on the local economy, which was an incentive for the spaceships to show up for airstrikes.
The fact that the spaceship game was intertwined with the team-based FPS was really cool. FPS players (on planets) could be in the same clan/guild/corp as the spaceship pilots, and could call in airstrikes. In the spaceship game, your corpmates could maneuver into position and rain down lasers. This interaction had an effect on the local economy, which was an incentive for the spaceships to show up for airstrikes.