A good Star Trek title is hard to find and it's definitely not here. D-A-C doesn't offer much in terms of replay value. If you rock out by yourself or even via Xbox LIVE, you'll quickly become numb to the action. The simple victory parameters coupled with the painfully basic shooting provide an experience that you can become accustomed to in seconds, but there's nothing there to explore. No strategy, no campaign, and no complexity.
Best to save your 800 Microsoft Points for another game.