Suicide Squad had very few redeemable qualities

[Dark_Feanor]

Soundwave said:

To be honest I don't even know why Harley Quinn is even in the movie. Is she supposed to be a trained martial artist?

You really kind have to stretch believability to have her in the group as she has no physical powers whatsoever and isn't really even supposed to be trained to fight as far as I know.

She was a Gymnast, she is violent and remorselessly.

She could be used to seduce and infiltration, just like Mistic from X-men.