system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] How can Quicksilver ever be beaten by anything less than a speedster/ reality warper?

No matter who he fights they should never be able to touch him since he perceives Everything so slowly time is almost still. How does he get beat?
gpt
Stamina. Dude gets tired. 

Someone like Thanos or the Hulk has nothing to fear from his attacks. 

He often is used for the greater good, in a team context. Huge debris flying towards an occupied building -- he's the only one who can save the occupants in time. When he's done, he's very nearly overextended himself.