For a game this massive and detailed, 60fps was never a realistic option; a solid 30fps is an acceptable tradeoff here.
Kudos to Monolith for prioritising concept and performance consistency. They even managed to squeeze in some nice graphical touches like well implemented motion blur and crepuscular rays. What's most impressive though is that despite the world dwarfing just about anything else on consoles, it's almost entirely seamless, with the ability to fly at high speed across entire continents without ever encountering a loading screen.
It may not be a showcase of cutting edge technology, but honestly this is still one of the few current gen games that makes me feel like, "whoa, I never saw anything like this last generation".