I think the points expressed in the article are valid, however I feel that all of these things are paper cuts and will be ironed out over time.
its quite amusing to note how much backlash there was against kde 4. everyone was screaming and shouting that they were killing kde. then came gnome 3- that was the worst thing ever, now unity and omg!!!!
Now everyone has come full circle, and are hailing that same kde 4 as the unity saviour. Software matures and given time, and knowing canonical, unity will become a rock solid desktop. and if its still a little too immature for your tastes, well then stick with 10.04/ move to kde and wait for the next LTR. If they have accomplished so much in such a short space of time, imagine what it will look like in 2 years time.