I dunno I think R2 looked better...I suspect the main players have shifted focus to the multiplat and some secondary team is handling this.
In what sense ?
I only remember R2 has rather gaudy colors. RFOM has more soothing and coherent colors in comparison (Earth tone for human environments, blue tone for alien structures). R2 has much larger scale than RFOM (Goliath, Leviathan, Chicago bridge, etc.), more advanced fluid simulation and better lighting. RFOM had more realistic glass.
I think the R3 trailer color scheme is more similar to RFOM, which is great news. The lighting, environmental effects, and particle effects are also more pronounced than R2. The boat segment is on-rail but we have already seen other open battles.
Gameplay is what defines the Resistance series, so I don't really pay attention to the graphics. ^_^
e.g., The Chimera Hybrids in R1 and 2 always have gaping mouth in promo shots, which is rather weird. One of the R3 screens shows 2 Chimeras with their mouths closed. Now that is progress.