Call it biased but hamilton is the best driver out of them all by quite a margin, he can do it all and is quality when overtaking people by a big margin. Hes bossed alonso at mclaren and now doing the same to button and is only getting better.
Vettel is very good in front but carnt overtake to save his life after 2 incidents today and the crash with webber earlier in the season proves this.
Massa is not paticulary good compared to the rest at the top and thats about it.
Button is quality and very smooth and effortless but comes across as a bit of a wet sponge when its time to overtake and just seems to sit behind the guy for an age (apart from the last race of last season when he went mental).
Alonso has lost his rag and hes borderline dangerous.
Kubica is a good driver and would be interesting to see what he can do with a good car.
Webber is hard to explain hes a bit like button, good at everything but just not as good as hamilton.
I think this season would be over if Hamilton was driving one of the Redbulls.
This is all my opinion of course