Endless Space is a bit spreadsheet-y at times, but it’s very clean and is overall a fun experience… if you are a strategy game fan. And I mean fan as in a fan, not just liking strategy games in general.
Some aspects of it are a little bit restrictive at times, but I personally enjoy playing it.
UPDATE: It’s official. Endless Legends is a lot of fun to play, even at this early stage. I really feels like a true 4X, and, to me at least, it feels like it’s somewhat deeper than Civ 5, or at least has a lot of potential to be that way.
Let it be known that Endless Legends is certainly NOT Civ 5, though. The only similarity here is the 4X aspect of it. It’s certainly unique and enjoyable, and it’s possible to win by playing casually and also maximize everything through intense micromanagement.
All in all, 4/5 so far, just because of its feature-incompleteness.