the best of its kind

Game: Hyperiums, the Massive Galactic Wargame

At least, the best I have tried. It is hard to explain why it is so addictive only from its feature, as some other game have the same (Dark Galaxy, Planetarion have similar features, although I have not played both of them). The difference in hyperiums is that it is easier to interact with the other players in the server, and the pacing is better. Some conflicts involve hundreds of players over a long period. The politics and strategic aspects of the game are the best I have found in any online game. However it is one of the harshest game for the newbies, as they have little protection from wealthier players. The game lacks interest if you don't find a good alliance to play with, but once you do, it makes for a very interesting experience.