marvel and dc nerds, what superpower would both be a gift and a curse as seen from movies?

Immortality.

Without being paired with invulnerability, immortality just means you can not die, but that doesn’t mean you can’t feel.

Imagine you are under water, even in the deepness of the ocean, you can’t die, but every other injury that can occur can and will, and you’d be stuck in the constant state of drowning/pain without the release of death.