MS has vastly inflated stats due to Punting Hill off in Australia, dubious launch control on his Renault and a huge spell at Ferrari where no real completion existed.... He was good, possibly even great but just how good is hard to weigh up when there was so much stacked in his favour.
I think that this is really problematic, on a number of bases:
1. In 1994, Schumacher was beaten, on the track, once all season. He was disqualified from Silverstone (he would have won had it not been for the 10 second penalty), disqualified from Belgium (which he won), and banned from Portugal and Italy. He was beaten at Spain, due to a reliability issue in the Benetton, and was only beaten on the track in Belgium.
2. In 1994, none of his team mates could get anywhere near him
3. In 1995, when Williams arguably had the best car, Schumacher's dominance was even higher.
4. He then chose to move to Ferrari, even though he allegedly had big money offers from McLaren...
5. He
should have won the title in 1999 (but for his accident, he would have won).
6. The success at Ferrari was largely due to the team of people he brought with him.
If anything, the years 1996-1999, when he could have been in any car he wanted, were the lost years for Schumacher - where he over-achieved for the car that he had!