well ur right hpal is good tank healer but i think druid,or shamy are way better coz hpala cant heal 5 of them at same time,bosses in icc do aoe dmg which doestroys pala to compare in druid,shamy,or hpriest.Prot pala i agree its good in every situation.Ret idk i would rather invite spriest or warrior and similar than ret pala,but i would have 1 ret pala in raid only bcz of buffs nothing else.And last ur right as ret pala i was having no problem with doing combo or 1 shot smth its way simple,same with prot pala holding aggro and dmg reduction.But hpal is so hard to heal that i cant understand why people play as hpal coz rsham,rdruid are way better. i think hpal should be last to inv as healer coz he cant even bubble like disc priest and dnt have good buffs in compare to others.