I like to call this series "Tengen Toppa Gurren Lagann simulator" -- because it is, to my knowledge, the only space-themed 4X where you can build a ship as big as the Tengen Toppa Gurren Lagann, which is 1 million light years in length.
If you want to kick reason to the curb and do the impossible, this is the game to do it in. It has an incredibly detailed ship-building system. And it's also completely moddable, coming with the source code in text file form. This makes for a pretty big modding community, and that is always nice.
The first game itself isn't particularly hard, although it requires micromanaging at times, second one requires less micromanaging but has a more "realistic" max ship size (the size of a star).Overall it's a pretty solid series for any strategy fan to pick up.
Do you agree with these choices? Do you feel there are other, more deserving strategy titles that we forgot to mention? Do you want to share your gameplay experiences with these games? Post a comment below and let us know!