Let say those games are MMORTS(Massively Multiplayer Real Time Strategy) two of those games are Sci-fi themed(Ogame and Galactic Conquest), one is pirate themed(Seaskulls), and the last one is medieval time theme(Aegis).
I also played King of Chaos but I didnt like it because its played in rounds and there is no strategy to it oh and I think most people cheated but thats just me.
It would be nice if the game was in a medieval themed era(historic or fantasy), no rounds ever, it doesnt use "turns" or "ticks", has atleast a large comunity(if it can because its always nice playing with lots of people) and its in english(or atleast has a good english translation).