Uh, considering Jaina just owned Aethas (one of the six), I would guesstimate she's still quite powerful...perhaps strongest living mage on Azeroth would be appropriate, as I'd think Khadgar outclasses her to, probably Rhonin and Krasus also while they were alive. But Khadgar is chilling in Outland in old expansion hell. Still, wouldn't want to go against Antonidas' hand chosen pupil. And like you said, at least they aren't kill stealers like a certain jerk ass named Tirion...
Also Malfurion is far stronger than Hamuul, 10k+ year old Nelf druid personally trained by Cenarius? And you're saying his student is almost as powerful? >.>
Up till 5.2, Thrall was fairly balanced in power, but since then he's pretty much Green Jesus. Up till then he always seemed more like a warrior or enhance shammy at best, since he still wore Doomhammer's armor and used the Doomhammer as well.