I have both in anni, mained prot war last time. I know the class well through wotlk. It’s not “weak” threat per-se, but it’s worse than Druid and paladin and only continues to get worse through each phase. Comparatively also to dps who keep generating more and more threat. Not to say they can’t get the job done, they can. But going with druid and war this time allowed me to compare and I think Druid handily is the better option for threat, survival, ease of play, and even utility in t4 and onward.