This is early alpha. You can go anywhere you can look. On a training island. When it launches it'll be on a play space the size of 270 km2.
I won't flood the thread with pics or gifs. But ARMA 3, Crysis 3 both look better than SS. Check out the PC screenshots thread, you'll see them. SS is all about gameplay for me.
Even still, better is subjective anyways. So it really doesn't matter. If you think that it is great, that's all that matters. I'm more concerned/excited with the gameplay. If they just keep building on what they've already established with the previous games, it should make for an amazing game..
ARMA looks very boring and grey. The artstyle for inFamous is a lot more colorful/varied, and the particle effects only exacerbate this. Delsin's character model also looks much more detailed than the characters in that ARMA screenshot (including better cloth textures).