Star Wars Galaxies is the only one I've played and like. I've played and didn't like Guild Wars, WoW, and Lord of the Rings Online. In SWG, it felt like the game was really run by players and their interactions, from an economic and "political" standpoint. I've never liked combat in MMORPG's, but the crafting and feeling of living in a world run by other players rather than mindless NPC's made up for it in Star Wars Galaxies, just not the other games. Cities were built by players, you could own houses, pets, ships, vehicles.