what can fps's do differently?

[ghettoglamour]

There's actually a lot to it. Far Cry 3 showed me how rich and different the missions on a FPS can be. It's not all about shooting, climbing, light puzzles or an interesting story (Bioshock) are a lot more than your typical military forgettable capaign (like BF or COD). Actually you could also make an Uncharted-like FPS game, I think it could work.