Answered February 25th, 2020

Since 1991, Rex Grossman has the lowest passer rating by a quarterback in a game with 1+ win and more than 30 passing attempts, with a 10.2 rating against the Cardinals on October 16, 2006.

worst qb rating in a game won 1 by a qb that started after 1990 with more than 30 attempts
Interpreted as:
worst qb rating in a regular-season game won 1 or more by a qb that started after 1990 with more than 30 passing attempts

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