Radhja is right. It does't require that much from gear but it does require something. 10 man is really /faceroll in my opinion. I solo healed it for over the last weeks now and and have tanked it in my feral DPS gear with litterly 4 items gemmed / enchanted for tanking, which gave me like 33k health buffed. It was a joke.
For the 25 man it gets a little more tricky. All the damage is increased so if your walking around with 17k health buffed your gonna get pwnd in the vortex or in phase 2 by the scions. However this is how you will deal with the damage. The dps requirements is really low compared with what you could do if you do the encounter exactly as your suposed to do.
For instance, we went to eoe25 3 weeks ago after we cleared ulduar early in the evening. We had 6 healers 3 tanks and loads of melee dps(so see that as a terrible setup). And we finished the fight in 6m and 34s while not even attemting to get a kill close to the 6 min.
EoE is about understanding the game mechanics and how to do a fight probably without making stupid mistakes.
Yeresaijis <Gathering> - Lightbringer EU
Resto Druid / Feral DPS
The World of Warcraft Armory