system
Given the following post, respond as if you're commenting on Reddit:
human
[Suicide Squad] Why Captain Boomerang?

I admit I don't know much about him other than what we see in Suicide Squad, but from what I can see, he's just a dude with a bad temper that throws stuff. 

I'm sure there have to be be much more badass dudes in prison than him. His boomerangs are used as thrown weapons and drones, but I'd think the military has far more effective weapons (guns perhaps?) and military grade drones.

Basically, I don't see why he's exceptional or needed. He doesn't have any specialized knowledge or skill. A Navy Seal or pipe-hitting convict would probably be far better. He brings nothing to the table like most of the other squad members. Why is he there?
gpt
He started out as a member of the Flash's rogue's gallery, and aside from being an expert marksman with a lot of effective trick boomerangs, he's also ruthless, unconventional, and unpredictable (except for being a jerk, he's that in pretty much every incarnation). Throw him in a fight, and he's dependable to hold his own, and his real talent in that regard might just be survival - this is a human that routinely goes up against superhumans and doesn't end up dead or maimed.

Unlike a lot of the other Suicide Squad members, you could probably throw him in a prison and he'd stay there. Sure, he might carve a boomerang out of soap and kill a guard in an escape attempt, but reasonable precautions and all that. But for the type of missions the Suicide Squad does, he's almost perfect: skilled beyond the ordinary, eminently expendable, and can be coerced into taking and following orders by reasonable threats. You don't normally send Special Forces into certain death, but you can send Captain Boomerang and everyone will sleep well at night because *fuck that guy*!

And yeah, boomerangs may seem a little gimmicky - but so are batarangs. And Captain Boomerang is probably better with his boomerangs than Batman is with his batarangs.