Used to play EVE a long time ago in a known alliance. The game mechanics were not that good. What made the game shine was that it's an extremely complex sandbox game, where almost anything goes. This leads to a very complex game that is almost entirely governed by how the other players react to your interactions with them. The drama, dreams, hopes and despair that comes with playing the game is the real reward.

It used to be that the game was really harsh when you screwed up, which made the adrenaline pump when you did something you knew was dangerous. For me as a hardcore gamer at the time, that was the initial kick. Now a days I believe they have lessened the harshness a bit, but it should still be one of the few games where you can lose literally hundreds of hours in investment by losing everything you own in the game.