Despite texture compression, geometry culling , new Rasterization tecniques, voxels and so on, I don´t see the next gen being game changing. Raw numbers are an indicator, not an exact comparator, but still, considering all this tecniques we are still away from old days jumps and the feeling people will have even with the same amount of improvement will be lower because we are at a much better image quality level than we were in the old days.
Talking about metro, it has great atmosphere, particles, light, and so on, but faces and animation are not at the same level. Games like RDR2 and God of War look more real because of that. When I see RDR2 woods, it feels more real than metro to me.