ITs are soft these days too. Heck, even most NMs are soft. That's why people are doing 2k, 3k, 4k WSs. Mobs need to get back to the level of DEF/EVA they had in RotZ/CoP, where it actually took work to do damage, rather than instantly killing mobs by standing near them with a weapon out. The current state of NM fighting (aside from extreme lowmanning) consists mainly of holding back on damage so you can get in your droprate-boosting weakness procs before accidentally killing whatever pathetic weakling is ineffectually trying to nibble on you.
What made Atonement great was that (1) you didn't have to load up STR/ATK/etc. gear for it, because its damage wasn't determined by those stats, so it still performed well in actual tank gear, and (2) it was unaffected by mob DEF/EVA, so you could deal full damage to it even on HNMs (or what passed for HNMs in ToAU -- already showing serious stat/difficulty decay compared to players with merits).
CdC has neither property, it's just plain OP if you have it (and the DD gear, and now atma, to support it) and opens up even wider gaps between normally geared and extremely geared players.
This is actually part of the mobs-are-too-weak problem: SE can't design most mobs to be so strong average geared players can't fight them at all, but because of the now-excessive influence of gear, overgeared players destroy them with ridiculous ease. This game is unfortunately starting to resemble WoW where your gear defines you more than your job and level and ability to play that job does. Abyssites and atma have some of the same problem, but thankfully only inside Abyssea.