I've been dueling a lot and I can outlast the damage of any class for quite a while. If the opponent doesn't want to die, they won't because of holy's garbage DPS but I've managed to take down a few classes. That's not the point of holy anyway, I play it to survive. The most lopsided fight I've seen right now is DK vs any healer and I think that is because Necrotic Strike is broken right now. My 2 DK buddies agree with me on every level too. It's spammable and with a lot of attack power it absorbs waaaay too much healing, not to mention the 30% longer cast time of heals. It cannot be dispelled as far as I can tell, unless that is only an unholy DK thing.
Have you lived through necrotic strike? How did you do it?