Everyone seems to complain about Wotlk being too easy, but i would confidently say that 99% of those people have not done Lich king 25 heroic mode. people complain about Wrath having been so easy and blizz has given up on allowing raiders a challenge and that cata raiding will also be too easy. but people fail to realise that in their comparisons to vanilla, (who half of which never played they just seen videos) that there were around 5million less players to raid with, if a comparrison of the number of people who have downed Lich King 25 in heroic mode, was made against the number of people to took down KT in naxx in vanilla, compensating for the much lower wow population at the time, the numbers would be roughly the same.
people complain about wrath raids being to easy, but these people have hardly even tried the heroic versions at the time of their relevance. thers no use saying that wrath raiding bacome way to nub friendly etc. because yes normal raiding did, but blizzard reserved heroic raiding for those more hardcore gamers. So just realise that yes normal raids are shit loads easier then any raid was at vanilla, and most of BC, but heroic raiding and hard mode raiding (ulduar) during their relevant times are practically just as hard, and in most cases actually alot more creative.
so remeber that when you move into cataclysm and you might think raiding is still too easy, do the heroic versions then talk.