RF:A was one of the few games I ever preordered. Long story short, it's worth a playthrough, especially if you were a fan of Infamous, Resistance 2, Red Faction, or Descent. The campaign is somewhat short (even running on 24 hours of no sleep, I managed to blow through it in about six or seven hours), but it has some pretty fun moments and some cool references to Guerrilla.
The reason I mentioned those four games earlier is that RF:A seems to mix a lot of elements from those games; the superpowers from Infamous, Resistance 2's tone and atmosphere, Red Faction's universe, and some really cool Descent-style levels. I personally think it did all of them pretty well, but not exceptionally.