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Given the following post, respond as if you're commenting on Reddit:
human
[DC] Why exactly would a Suicide Squad need Harley Quinn?

In every lineup I've seen her in she's always the weakest link. She isnt a meta-human, she doesnt have any formal martial arts/marksman training (even when she demonstrates this there are usually two people on the team that are better than her in these regards), and outside of being a former psychiatrist she doesnt seem very insightful. She's just eye candy and extra muscle. It doesnt help that she's a basket case. I know the Suicide Squad is suppose to be expendable, but each member should still be relatively useful. I didnt wake up this morning planning to shit on Harley Quinn but who could be a worse choice?
gpt
>She isnt a meta-human, she doesnt have any formal martial arts/marksman training

Neither is the Joker and he's a citiwide disaster every time he escapes Arkham. In comic book world being crazy is a super power. 

Harley is basically joker-lite who's a bit more on the side of reasonable.

Another benefit: on a team full of insane villains she is both a psychologist AND insane herself and close enough to the anti-hero side than the pure villain side. She's the psycho-whisperer and group glue, the one most likely to get killer croc to stop eating the other teammates.