It doesn't seem slow, and maybe while Red Bull was not allowed to share the IP for the new car, it doesn't mean that they didn't hand STR scads of data on the old one.
Buemi needs his breakout year this year. He had some good performances last year and earned his drive for 2010. When a driver is really good in the wet as he seems to be, it means he can feel his tires better than most, and I have yet to see a driver who was great in the wet, be slow in the dry.
He could be a bit of a surprise.
SV said in an interview, that since rain tires were so expensive for his kart when he was a kid, that his folks couldn't afford to get new ones all the time, so he would run his slicks as long as he could in the rain, making him a better driver.
Hamilton was given all the rain tires he needed from Macca, and while he is obviously also a master in the rain, it shows that hardship can form a good driver as well as coddling sometimes.
Before I do anything I ask myself “Would an idiot do that?” And if the answer is yes, I do not do that thing. - Dwight Schrute