10. Fragmentation...The fact that Google is pushing Jelly Bean and ICS barely has double digit penetration is utterly pathetic, hinders app development and ruins the user experience in a huge way.
And iOS isn't? Why doesn't the 4 or the '3 year old 3GS' have Siri for a start? Anyone that thinks that the hardware can't cope, is frankly stupid.
Also, iOS is not that smooth. Mine hangs and gets a bit sluggish on occasion.