Schumey's good, but how can you compare him to Senna, Prost or Fangio? Senna was a freak and give him a crap car and he too will give you a good run for your money. I reckon these 2 are on par. Prost is a champion in the turbo era and the post-turbo era. Driving the old turbo cars, you need balls of steel cause 1000bhp is not easy to tame. Fangio, need I say, the man who came up with the modern racing techniques.
But the biggest arguement I have is if you have the backing of an entire team, of course you will do very well.