Who was the worst quarterback in NFL history?

Answer 1

Ryan Leaf was the worst quarterback possibly even the worst player to play in the NFL ever. He never called a play right , had loads of interceptions, and didn't know how to evade the pocket!

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Ryan Leaf was a STARTING quarterback, which means he was MUCH better than most other quarterbacks in NFL history. To answer your question, it depends on how you define "worst", and very few people keep track of the worst quarterbacks.

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Leaf was one of the worst quarterbacks who ever got significant playing time in the NFL, which is what I think you're really asking for. The least effective quarterback who ever got a chance to play much was probably Kim McQuilken, who played for the Atlanta Falcons in the 1970s. There's an article on pro-football-reference.com that studies this issue. Leaf ranks very high on the list of "stinkers" no matter how you evaluate it, but the final analysis tabbed McQuilken as the worst.