Caustic is a more fun, better voiced, cooler looking, and way rarer than Mirage. But yeah, he's for funsies not serious play.
There's more going on with him than first glance. Grappling hook momentum can help you cover a building's worth of distance like spiderman. I'm not good at it yet myself. But Moonmoon's maining him and his hook swings are pretty on point. Also Zipline recharging every 2-3 minutes is sweet.
This is probably old but still great.
That animated so well. Man that's cool.