I have raided 25 man, it was really easy all I did was tunnel a boss. hand of sacrifice, hand of salvation, bop, loh I never used these things. People see 10 man as easy because there are less people to fail the mechanics, but since more is place on the player its less about numbers and more about utility of class and being able to handle different roles in a raid. Come on, now that I said that scream at the top of your lungs that 25 man is the "hard" fight as you tunnel the boss. I understand both are hard and some fights tune different and easier for 10 or easier for 25 man. World first was a wha...25 man....you don't say....does that mean its easier because it got beat first.
10 vs 25, deal with the fact that it will never be balanced that every fight isn't going to be the same. 25 man has its difficulty and 10 has its own and they are not that different. The hardest part of 25 is getting 25 good players.