"I'm not enthralled by long tech trees; and I don't care to win by loving everybody."
That does shoot down two of the possible ways to win this game, which would definitely increase the repetitiveness of the game...

Because I'm lazy, I'm going to quote myself now, from a post I made about this topic on Gone Gold's forums earlier today:
"The replayability, for me, comes from the different game types and types of victory. You're right, within a given type of game (say, Large map going for a Technological win), what you do is quite set: there's pretty much an optimal way to play to achieve victory in that context.
But if you change the map size (or other map settings), you have to change your 'early game checklist', since expansion works differently then. And it may not be obvious exactly how to do that, which is where strategic experimentation comes in.
If you choose to pursue a different victory type, how you play and what you prioritize will, obviously, change drastically.
If you change the AI's morality settings, you'll have to play differently, as the game will get considerably harder if (for instance) you tend to play Evil and set all the AI's to Pure Good.
Within one particular game type, I think you're right, in as much as this game feels more linear, strategically, than Civ does. But the sheer variety of options for changing the game type give it replayability for me -- it's going to take me a long time to exhaust all the possible paths to victory and ways to play this game.
Keep in mind, too, that Stardock will be adding new techs to the tree, new ships to the game, new random events and morality choices, etc... and players will be doing the same. Over time, if you keep up with the professional- and user-created mods, I suspect this game will change considerably in both feel and strategy required."
- Ash
~SDC~