I agree with you to a point. At least with the "very fast" greens. If it`s an uphill putt I`ll hit it as if it were "normal speed" rather than take a few feet off. This is in fact true to real life golf but, there are some greens that seem to just play at normal or even slow no matter what the stated speed is. Some that are down hill need to be played at normal also. I`ve just gotten to remember which ones they are, and play them like that. Although several times I`ve forgotten, and start groaning as soon as I`ve let go of the putt, knowing I should have given it more speed. This includes the putts that just have an up arrow(^) with no elevation shown or even some with the down arrow but no change in elevation.
The "slow" greens are a nightmare for me, having left putts short after giving an extra 4-5ft power on a 9-10ft. level putt, etc. I haven`t played the slow greens as much but in time I`m sure I`ll get used to them also(unless WGT tweaks them, which I think they should).
So I`d agree they`re inconsistent to the stated speed but, they`re consistent as to which ones are "inconsistent". Hope that makes a little sense. GL