Yes, the tirerack test of the Cooper cs5 ultra is very strange. All objective test results are very good, especially when taking into account the relatively low price of the coopers. Still, it was considered a failure because of "subjective" test results.
Other tires were considered "excellent in wet" for objective test results in wet as good as or worse than the results of the Cooper cs5 ultra. Still, the coopers are considered only "decent in wet".
Objectively, the Cooper cs5 ultra seems to be better than the General rt43. And the latter tire is highly recommended by tirerack. The price seems to be about the same for both. So figure....