There are two PS4 games that don't run at 1080p. Two. BF4 and this. Everything else is 1080p. It's the de facto standard resolution on the console. Infamous is 1080p, and looks much better than this. So while you're right that the PS4 cannot be expected to match a much more expensive PC, there's nothing odd about expecting 1080p. The PS4 has been shown again and again to be fully capable of it, so when a game fails to achieve that it's perfectly reasonable to ask why the hell that is.
There's certainly nothing wrong expecting 1080p and 60fps from a cross-gen game that has suffered various downgrades.