Hmm, guess since my Resto shaman is healing MT in Kara, Gruul, Mag, etc means I must be the least viable healing class in a raid. I have never needed more than 3 mana pots in a boss encounter in each of those instances. I generally stay in the top 2 of my healing meter, but our resto druid has the leet HoT's as well. We almost never use Holy priests in raids, its all about the Shadow priest these days. Pally's do bring some amazing buffs to the raid which make me an even better healer in general. But I will say this. its not your class that makes you a good healer, its your skill. Only advice i can offer:: learn your class, or quit dumping on those who know more than you.