People look for reasons to say they aren't that good.
While I can't explain the complexities of human nature that lead people to do this, I can debunk some myths.
I'll start with oe of the biggest lies floating around football talk this decade: Aaron Rodgers isn't a good in championship games.
This myth is remarkably ludicrous as it suggests that 3-time MVP, Super Bowl MVP, sure-fire first ballot Hall of Famer, generational talent, and walking highlight film Aaron Rodgers somehow just regresses to a terrible quarterback when the pressure of a big game arises.
The biggest piece of "evidence" to support this claim is that Rodgers has a 1-4 record in NFCCGs.