to be honest, you cant even compare archimonde vs LK hc. paragon even wiped over 500 times at ragnaros hc. does that mean, cata was harder than wod or wotlk? hell no. whole fireland was a joke, except, ragnaros.
you have to consider, that in those 3 weeks, the gear got a lot better and the buff got increased by 5%. i think they killed LK hc almost right after the 5% buff or the 10% buff, am not sure.
besides, all the classes got a lot easier themselves. compare a hunter from wotlk vs wod, the biggest difference is feral. feral was like the "hardest" class bec of the prio, now its utterly a complete joke as well.
and if u have 700 ms, then its your own fault to play like that. and if i might add something, 2% is nothing out of 100k? 50k? i have have a lot of placements at WoL and that is top200 only :)