That last comment about facial expressions reminded me of the old cartoons where they would super-impose a human's mouth over the static cartoon cell
One thing I'd like to add about animations, sandbox RPGs usually have a greater number of animations than FPSs. For starters, compare the number of animations for the main character in an 1st and 3rd person RPG vis a vis the number of animations for the main character in an FPS. NPCs in a FPS have much less animations as well: only those necessary to shoot what they are shooting, running around, and dying, whereas an RPG like FO has animations for everyday actions, as NPCs are coded to do every day stuff like travel to places, walk around, run around, go to bed, etc..
