Sadly, I believe that today even wet-weather drives are too car dependent.
Hamilton was a brilliant rain driver from 2007-10, but as of late he just can’t get the mood going. I guess that Mclaren isn’t as good in the rain as it once was.
Alonso won in Germany and took pole in both Great Britain and Germany; he is great in the rain but I don’t know how much that has to do with the Ferrari itself.
Vettel had a reputation of being a good rain driver back in 2007-09, but I can’t think of a single good wet-weather performance of him for the past 3 years.
Schumacher, in my opinion, is still the best rain driver on the field. His drive at Canada last season, his comeback through the field in Britain ’11, and not to mention that he managed to get his Mercedes on the 2nd row in both Silverstone and Hockenheim with a car that isn’t easy to drive at all.