Blizzard is getting very creative with their Heroes now, which has been shown with their recent additions. I have played a few games with Lunara, but her learning curve is incredibly steep due to her low health pool. She is targeted often by enemy teams due to this, but as you get used to her mobility and advantage of her Wisp, this is easily negated with careful planning and positioning. If you were looking for a new Valla to play, check out Lunara as she entered the Nexus.