Tsi-Shu are the guys in humanoid form that shapeshift to melee creatures temporarily and can beat you up if your injured from the Tsi-Shu energy fire or your too close for extended period of time. That doesn't sound like a "We suck at melee" thing that sounds more like a manouvering and timing type situation. There is nothing that suggests that meleeing is considered automatic death but then again there is no virtual ground to stand on just yet and its a wait and see thing but denying the possibilites before there is even the possibility is kinda pointless.