What don't you like about it?

I have a theory (untested): The more athletic a rider you are, the closer you want your gears. I don't like three speed hubs because the gears are spaced so far apart. I end up using only two gears. Citi Bike bikes are geared low, so I use the top two gears. This is true for both models, even though the S-A bikes are geared higher than the Shimano bikes. Old English 3-speeds are geared much higher, and I end up using the bottom two gears.

So if I had a NuVinci, I think I would adjust it a bit here and there, using a narrower range than a 3-speed hub offers.