They rated the Tesla Model S in 2014 and 2015 "Best Car Ever". It had the highest "buy" recommendation they've ever had for two years. In fact it was one of the reasons many of us bought it during that time. Last year CU said Tesla's P90DL had the highest performance ratings of any car they have ever tested. It broke their testing methodology. I bring this up because it doesn't fit the statement "Consumer Reports almost never gives high scores to high end products." I think what happened is over time the 2012, 2013, 2014 cars started going into the shop and reported problems while at the same time Tesla started improving on their side in 2015 and 2016.
I said "almost". There are exceptions, but not very many.