Even as a turn based strategy game, it's actually somewhat slower than what I'd expect it to be. There are times when it requires your quick reflexes but that's not always the case. All in all, the game moves pretty slowly - more than you'd want, in fact.
Granted the plot isn't new - empires racing against each other to gain dominion over all is a tried and tested gaming scenario. It's a long game, trust me it's a very very long game. It's going to be tiring and after a while it will lose it's appeal unless you've managed to conquer enough areas that you soon lose track of time. The number of Star Systems is huge, but don't be too impressed by the massiveness of the game, as it is pretty repetitive after a while.
All things considered, it averages out, and if you love 4X games: go ahead. The learning curve is pretty shallow, with those new to the genre taking about an hour to get a handle of things, while the extreme fans will find the controls they want right away. It's pretty basic and the interaces are spaced out well enough to understand easily. Hence the averageness of it. It doesn't suck, but it doesn't blow your mind either. For me though, I'd rather play something else.