Although I think they have done the best they coudl on the numbers the have collected, I wonder if:-
1 More linux notebooks shipped in Q1, and linux users are more ready to have a go at fixing things for themselves or conversely later machines had more windows and less skilled users 'messing them up' - I am not a linux user myself but would opt for it if I was getting a notebook (unless Apple comes out with something AA1 sized and similarly priced - yes I know.......)
2. How many of these issues were OS/Config/Software/User cock-up related and not hardware issues?
Nice to see figures in context though.