@xMarlboro I bounce back and forth between Mackay and Casper as my mains. I think Casper is a fantastic Specialist to use and far from being useless. You're able to detect nearby enemies, which definitely helps once you get the hang of that. The drone is a huge advantage to your team.
I made a post a long time ago requesting a callback feature for the Drone as well. That would be really great instead of having to leave it, wait for it to lose signal, then it starts the cool-down. Or sometimes you forget that you had it out, and it's not in a great spot, and takes a while to reposition it. A callback would help with those scenarios.