[IROC]

I posted "de Crasheris" somewhat in jest, but then went and checked his wiki page and he might actually be the worst:

Andrea de Cesaris (born 31 May 1959) is an Italian former race car driver. He started 208 Formula One Grands Prix but never won; his is the longest career without a race victory. A string of accidents early in his career earned him the nickname 'Andrea de Crasheris'.[1] Though the nickname stuck, he became a more reliable driver in his later career.

...and:

In 1981 de Cesaris, partly due to his Marlboro connections, landed a seat at McLaren. He managed to finish only 6 of the 14 races he started, with a sixth place at Imola as best result. This was not enough to convince the resurgent McLaren team to keep him on. It was at this point in his career that the nickname "Andrea de Crasheris" was coined. The team was so worried that he would crash the car to the point that they withdrew his car from the Holland Grand Prix in Zandvoort after he qualified 13th.

and finally:

He participated in 214 grands prix, debuting on September 28, 1980. He achieved 5 podiums, one pole position, and scored a total of 59 championship points, but remains the driver with the most GP starts (208) to his name without a win. He also holds records for the most consecutive non-finishes, 18 across 1985 and 1986 (although many of these were mechanical failures), as well as the most successive non-finishes in a single season, 12 in 1987. Similarly, no driver has had more than his 14 DNFs in a 16-race season.