in my opinion, senna was a better quailfier than a racer. the stats tend to agree with me :65 poles-41 wins.
Overall, I don't disagree with that. There is a good case to argue that Senna perhaps put in too much effort into qualifying. Also, that Senna pushed too hard in races, which possibly contributed to some of his mechanical failures (although, Formula One was a lot less reliable in Senna's era; Formula One cars are almost bullet proof now). In my view, Senna's biggest weakness was failure to accept there were some races he could not win. He showed he could play the percentage/damage limitation game in 1991, but lapsed back into his old ways in 1994, trying so desperately to win, probably in disbelief at just how bad the Williams FW16 was. Senna pushed too hard in Brazil and spun out trying to win a race that was beyond the car, instead of taking a decent six points which would count for a lot in the championship battle. Schumacher was no doubt a little more race savvy, but it also has to be remember that radio technology was so much better in his era, so a driver could actually have a discussion with his engineer on things such as strategy. In that regard, Schumacher was at a real advantage over drivers in the 1980s and early '90s, for he could converse with Ross Brawn - a strategic genius - who would devise a race strategy for him. Because of that, I rate Prost as the greatest racer, although Schumacher isn't too far behind.

Ayrton Senna: WDC 1988,
1989, 1990, 1991
McLaren: WCC 1974, 1984, 1985, 1988, 1989, 1990, 1991, 1998,
1999, 2007McLaren: WDC 1974, 1976, 1984, 1985, 1986, 1988, 1989, 1990, 1991, 1998, 1999, 2008