Well, I think what most people ultimately really complain about is the price difference between the 16GB and the 64GB model. The 16GB model is $649. The 64GB model is $749. Wow, what an outrage! $100 for an extra 48GB! They are ripping me off! Impossible.
The bizarre thing is: If Apple didn't offer a 16GB model, but just a 64GB model for $749, it wouldn't be a topic AT ALL! Nobody would talk about this. People would say that $749 is a lot, but that's it. But the pure fact that a 16GB model exists at such a lower price is a thorn in people's sides. They buy the 64GB model, because they feel that's what they need, but they feel ripped off, because of the "cheap" 16GB model.