I paid full price for Mirror's Edge back when it came out and it was worth every penny. It also has more than one mode. You've got the story mode, and time trials at least, not to mention hunting for the different runner's stashes in the game (which sounds like it would be a boring fetch quest busy work sort of deal like every other game ever made, but isn't for the first time in history).

And I have to disagree with it having little replay value. It really depends on what you're looking for. Want to blow through the story as fast as possible? You'll play it once and never touch it again. But if you recognize the game for what it is, a playground that gives you a variety of skills to move through it and have fun, you'll keep coming back. I go back to that game every few months for another play through. There are always segments that can be done faster or more smoothly, places where alternate routes exist to explore and utilize, and the sensation of defying death never really goes away. Nor the sheer terror when you miss a jump and see the ground come rushing towards you.

This game had more replay value for me than most sandbox games with days worth of extra content. This doesn't need it. It's fun in the same way Mario Bros. was fun. Here's your moves, here's your goal, have fun.