Anyone saying Atmogs is overpowed is pretty ****ing dumb, and I have yet to meet someone that believes its OP and is still sane.
Both the Atmas and Warmogs are core to the tanky dps build.
Every role has 1. Carries end up with PDs. AP get the Deathcap. Those are core items.
The reason tanky dps get atmas is because it gives off decent damage (not as good as stacking BT) and surviablity. However, they really need this. They are always in the fight and taking damage. If you try to play as mele and not have this hp, you'll just feed.
Now, some people will argue that it is better than the Deathcap and PD.
Well, yes. It is. But lets not forget, it is TWO! items. It takes up two slots. And it costs 5330 gold, which is more expensive than the other core items. So no. Atmgos needs no nerf, and should be left alone.