Relatively, absolutely. Peyton, especially in Denver, couldn’t throw anything but lame ducks.
Brees has been very honest about how badly his arm depreciated after the injury in SD (played his whole Saints career with ~75% of an NFL arm (and that’s with his college prospect profile being an average arm to begin with). Go watch his New Orleans highlights, they’re all lob passes and teardrops.
Joe Montana famously had one of the weakest arms in the NFL, and he was his own critic. Joe Montana's famous quote, "I don't throw darts at balloons, I throw balloons at darts.”
People commonly mistake downfield accuracy for arm strength, and that’s two completely different things. Hitting a receiver in stride 30 yards downfield doesn’t mean you have a stronger arm than Anyone else, every QB in the league is able to hit that throw (maybe not as consistently). “Weak” is a relative term. Every QB in the NFL has an NFL caliber arm, that’s not what we’re talking about. But there is a wide range of NFL caliber arms, and none of the guys I listed were near the top; none of them would even be considered league average. Compared to Stafford and Vick and Favre and Mcnabb, Warner threw underhand. But it doesn’t mean he couldn’t hit an open man deep downfield.
Do you know about the combine throw power test? Do you know what Mahomes was? A blistering 60mph. Josh Allen? 62! Carson Wentz had a pretty lively arm, and he got 57. But That’s like the difference between a pitcher who throws 100 and a pitcher who throws 93. Now Jalen Hurts, for instance, absolutely has below average arm strength. But he still gets the job done. His Throw power? 54. He’s as far away from Carson as Carson is to Mahomes. Do you know who else threw 54? Dak Prescott.
Just because Joe Montana didn’t have as strong an arm as Dan Marino doesn’t mean he couldn’t out play him. But seeing Joe outplaying Dan and then pretending that meant he had a better arm is silly.