It might look a little rough around the edges, but the "persistent" features make it a really interesting choice. Theoretically, we could host a private server where we all had our own nation of pigmen, where we could hotdrop in or out at will and the game could run indefinitely. Worlds seem to be randomly generated. There's a lot to offer here: It supposedly solves the #1 problem we have with most 4x games which usually require everyone to play at the same time for long sessions. Not sure its something that interests us, but I thought it was worth mentioning.