Blizzard have commented on this already;
I disagree with the suggestion that they aren't buffing dps. For the ~6 members of the raid who are DPS, an 8-10% increase in HP is fairly useless anyway, since if the boss hits them they'll be 1-shotted irrelevant of these buffs. For my hunter, the buffs give maybe 2-3K more HP, its only really useful if i'm standing in AoE and even then your talking about it buying you one tick extra to get out of the AoE (which is the main danger to ranged dps in most boss fights right now).Originally Posted by blizzard
However a 10% boost to DPS is huge, infact from iLvl200 to iLvl 226 gear your probably talking about a ~20% increase in DPS (hugely dependent on class), so these are big buffs, and being in a 10 man without them is like fighting in gear thats at least a full tier below what you actually have, often thats the difference between sucess and failure.