I often figure 10man is only easier because it highlights each individualy character's gameplay (not gear) more. So if I take a 25man raid, pick 8-10 of the upper half of that raid, ofc relatively speaking the resulting 10man (even with 1-2 less adept players) is better than the 25man.
My guild is not fantastic. We are okay. I do find 10man content easier but that is probably because I out gear it....the bosses still fall for me like they fall for you.
You kinda shave off the lower 15. :P
-- (The Death of Rats, Terry Pratchett, Soul Music)