I occasionally see whm using medica 2 like sch uses succor before the pull. Whm have enough aggro problems as is, they shouldn't intentionally be starting a fight with overheals ticking away on everyone.

The worst in my experience is Titan HM and the T2 enrage. (though I think my food fell off when tanking T2 that time and lost accuracy). SO many tanks lose aggro to whm in Titan HM.