R2 looked brown and cartoony
R1 looked grey and real world-ish
R2 is incredibly inconsistent. Some areas look alright, but then you walk up to a car and it makes GT5's standard cars look great. Google maps and PS2 textures galore. Plus it didn't have any awesome snow effects.
Both games have really low-res textures. So do the Ratchet PS3 games but at least those run at 60fps. I just get the feeling insomniac's engine is not built for sharp textures at all. Either that or 1 game a year means no time to draw high-res textures.
[youtube=560,345][/youtube]
The part ~4:30 where you fight as the spider tank vs. goliath in the snow still looks really nice. Great animations and effects.
[youtube=560,345][/youtube]