1) It must not force us into a single playstyle that relies on long-term ramp. In other words, it must allow for the ability to deal better burst damage, both single-target and cleave/AoE, possibly by sacrificing long-term damage ceiling (although realistically our single-target is already sub-par; I feel very bitter that I have to feel uncomfortable in wanting a kit that makes us as good as boomkins on as many things).
2) It needs the ability to handle very large pulls just as well as anyone else. When the tank says "Fuck it" and pulls three packs at once, we should be just as excited as everyone else, not groaning that they get to shoot their bars to the moon, while we're stuck dotting 20 mobs one at a time and ending the fight having done half the damage as the tank.
3) It must not be overly weak to heavy movement and phase changes.