I think MS was a fantastic driver in his Benetton and very first Ferrari years, not sure in the rest of his uber winning later Ferrari titles (where I think he was "merely" a very, very good driver).
One of the reasons for I admire Jack Brabham is his performance along so different seasons. Particularly I admire his 1970 season. He was in the top with very different cars respect those in his first years and against a different generation of younger and talented drivers (Rindt, Stewart,...). And don't forget 1970 were a very dangerous epoch in F1 and Jack was 44 in that year... An underrated champion and a striking off topic by me!