In terms of technology and aesthetics, I remember being fully and completely blown away by BioShock when it was first released. The visuals, the art direction, the ambition -- all of it. BioShock was simply a glorious looking world. Now, thanks to the Unreal Engine 4, it looks even better.
Noodlespagoodle took all the original BioShock assets and chucked them into the new Unreal engine, just to see how the game would look. Interestingly, if I remember correctly, the original BioShock was created on a heavily modified version of the Unreal Engine 2! Not the Unreal Engine 3, the engine that provided a backbone to so many video games last generation.
It looks great obviously -- BioShock has always been a brilliant looking game -- but this video has gotten me hankering for a similar visual sea-change in upcoming titles. To my mind, BioShock was one of the first handful of games that really looked 'next-gen' from a visual standpoint on the Xbox 360 at the time. I want to be dazzled like that again.