My biggest gripe with WHM is how it generates tank levels of enmity along how the other 2 is just all around more comfy for the party (pets healing, natural dumps in Sects).
I did some calculations some time ago. This doesn't (hopefully) happen in any realistic situation but let's roll some numbers for a while. Because of +healing traits and natural higher cast strength due to being a caster, a Cure III spam on 8 people will generate so much aggro it's straight up impossible to keep up as (any) tank even if you solely spammed aggro combo in tank stance.
Butcher's Block generates 2100 aggro as a finisher. Whole combo generates average of ~2400 per cast with Defiance counted in.
8-man Cure III generates 2200 aggro (550potency x 8party x 0.5aggro multiplier)
WAR wins by small amount, right? Now go check traits and compare weapon damages and we now have WHM winning by a mile.