I actually really liked Deadpool 2, although I'm not sure if David Leitch is the right guy for a sequel. I'd rather not have an action comedy, and I think most longterm fans want a back to horror approach. That being said, of course the movie doesn't need to be a comedy with him at the helm, he appears to have directed at least one film that wasn't an action comedy: Atomic Blonde.
I've only seen his film Deadpool 2 so far.