I still don't get gitmob

I have been healed from running mono squig, still love them and all my lists will continue to have them, but I have all the trolls, all the squigs, and a decent chunk of gitmob (Release box and doom diver). I still dont really understand how/why someone would take the gitmob, they seem so mid in game. Can someone hopefully explain to my how/why I should be running them? TIA