I think it's just how foliage reacts to lighting that seems to be the issue for some people. Foliage quality "looks" much closer, if not identical, to older footage, where the weather is overcast and, as a result, the lighting and foliage - less bright:
So, I think the discussion shouldn't be the asset quality of grass, as I don't believe it has changed, but rather about how grass reacts to lighting, especially in sunny weather.
Personally, it looks just fine to me, but others are clearly bothered by it.