Yes it has been a huge disapointment, just like all phones with Linux have comparatively failed in the US market so far. I saw a Google rep admit it on CNBC last week during an interview discussing this very topic. Linux fanbois are so amusing, always claiming this is finally "the year" LOL.
You can think whatever you like about the subject, Windoze fanboy, I am indifferent. It won’t change the fact that time will find the Android OS (barely out 4 months now) to be a major player in the smartphone market, and it will migrate to other devices.