I still remember my impression when I first read about this case and listened to both song one after another. Even tough I thought I belived to have a strong skill to find similarities between songs this pair made me sweat. I listened to both songs again and again, and asked myself where are the similar melodies? Then I obtained and read the related expert analyses. I've found so many points in these to criticize that I finally could not resist writing my own analysis.
The analysis is completed with an appendix: a third party song example with a constellation of similarities with Blurred Lines - showing that a constellation without melodic similarity does not prove anything.
My judgement: no infringement, inspiration yes.