I know I'm not good, so whether I personally find a game easy or hard isn't a refelction on whether it is in fact an easy or hard game; but it did seem popular consensus amongst twitch/youtube/forums was that the game on it's hardest difficulty (was it called Inferno, I forget) was stupidly overtuned where they literally just put a '00' on the end of all the numbers compared to the previous difficulty and it was just stupid, no one actually "played" the game on that difficulty they just did 'chest' runs or runs of that part of Act3 before Azmodan where you vault/teleport past the mobs and just smash wossnames urns or w/e.
So that OP starts the thread (I get that was months ago) with "When D3 came out it was boringly easy" or however he expressed it; it's hard to take anything else they write seriously.