Is Caitlyn a good late game adc?

imo yes she is really strong laning and late game for her control and headshot damage.

Every adc is a late game adc.

she's the most broken adc late game. once she's full build and she has shields and peel, it's done.

Caitlyn is strong early-game and late-game due to her safety, range and siege potential.

She is comparatively weak in the mid-game due to her lack of steroids and ability damage.

Yes.