It's understandable for a couple of things, but this guy has highlighted quite a number of things. Also If they were going to cut those features they shouldn't have shown them in the D3 gameplay introduction vids.
Yeah I wouldn't say they lied to us since they are allowed to change their minds but what I will say is that many things they changed were made worse than initially stated. So many, many cool things were beaten into oblivion and made boring.