system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] If Thor and Hulk can lift millions of tons why do they still get hurt by attacks from street-level hero Spider-Man, Iron Fist, and etc?

If they are so strong, it doesn't make much sense that lower-level characters can wound them at all.

Or despite their strength, they actually have a low defense?
gpt
You choose some really bad examples. Iron Fist is at near-peak human strength before he uses his chi manipulation. When he does that, he's strong enough to take down a helicarrier or destroy a nuclear train in one punch. Spider-Man is also at least a 10 tonner and has had feats above that. These two are only street level because they want to be.