No, it is not. The only thing remotely close to "core" for RoA was in Kassadin, who got gutted and had his identity ruined twice. I don't play him anymore so i can't speak for him. I don't play Cassiopeia either. I don't think the abomination that is Ryze should even be considered anything else than a ball of cancerous stats, so he's out of the list as well.
But I play everyone else. And if you rush RoA on Lissandra you're stupid. If you rush RoA on Syndra you're stupid. If you rush it on Orianna you're stupid. I could see it perhaps horking on Morgana mid, but not alot play her that way. I've never seen Zyra mid buying RoA either. I've seen many Annies doing well without it, so it's not core for her either. I've seen many Anivias do well without RoA as well. Hell, Froggen doesn't buy it many times.
And now I'll tell you a secret:
A raw shield, is not a deffensive stat. Athene's gives a fraction of MR; the only reason you buy it is for those niche situations you need mana regen and magic resist at the same time. Morrelonomicon's AP+CDR+Mana regen+GW is always better, but it doesn't give MR. I have no clue what "Crystal Maiden's Scepter" is. Abyssal Scepter, is once again niche. Not your average pick. When you need high amounts of MR packed with decent AP. It works on situations where an immobile mage plays against a bursty AP assasin(face it, AP comps are a thing of the past so the aura is worthless).
Health, health on AP champions is nothing but candy when compared to the AD itemization, especially with all the new stuff they got.
Defensive item. Gives raw damage and MR; compare it with its AP counterpart
AD+CDR, builds into
great defensive item. Also builds into
AP mana regen and CDR, builds into
and that's it.
Cost increased, armor nerfed.
The value you get out of those items is enormous.
Great against crits. What does AP get? Nothing.
Tailor made for ADs to battle tanks. What do APs get to battle tanks?
(HG has the same penetration passive)
AP is obsolete, tanks no longer build enough MR to make the value of AS really worth it
Same with AS, but it has a greater boost to AP.
Thanks to the items and fucking stupid masteries, Grevious Wounds on APs is now pointless, because they get outshined by the stronger GW on ADs AND their new sustain toys. GW now also applies on self-heals only. So getting healed by a support or someone else's
will have no impact on your AP's GW, which makes the value worthless.
Lasty, compare the flexibility they get over APs=> Null-Magic Mantle builds into 6 items for ADs but only 2 for APs. And that's just an example.