As you say the uncanny valley really shows through when the physics doesn't look right. For me the worst uncanny valley offenders were the agents, e.g the ones

As you say the uncanny valley really shows through when the physics doesn't look right. For me the worst uncanny valley offenders were the agents, e.g the ones that leap forward through the air but their suit doesn't so much as flutter. The slow motion effect seems to be used here to cover for the lack of animation. In terms of effects the fire and explosion effects had obvious clipping as objects pass through them where a realistic, but more taxing, effect would utilise particles. At this stage I feel like the engine is very good and sure processing power is still a factor, but I feel like the biggest factor is cost/time. Small details that make something look natural are sure to go when there is budget or deadline.