Yup, I remember seeing his armory 1-2 months ago and of couse he was in a terrible 10 man guild with no heroic kills at all. A person like this is still entitled to his opinion but seeing that he has no experience in 25 man and no experience in heroic at all (maybe he have now but not back then) so his opinion on what is harder has zero truth to it.
I totally agree, because of the higher chance of failiure it will take longer to get a boss kill in 25 man even if its slightly easier when it comes to numbers (its usually not).

MMO-Champion



