Maybe this is why R* say next-gen and explains the lower than expected performance levels. Also why Quads seem to perform better.
The natural motion provided by the Euphoria engine (which is not exactly a graphics engine but a Dynamic Motion Synthesis (DMS)) is really amazing. No more pre-animated material! All motion is simulated in real time so you can get literally an infinite number of movement types.
With euphoria, animations are not canned but are generated on-the-fly by the hardware's processors as the game is played. Every tackle is your tackle, every haymaker is your haymaker.
Previously, animation data had to be manually created (through key-framing) or recorded (through motion capture). This is often expensive and laborious, and results in static, non-interactive data.
euphoria is instead based on a full simulation of a 3D character, including body, muscles and motor nervous system. This creates fully interactive animations that act and react differently every time.
Watch the youtube for a better idea. ( not a rickroll - promise )