Usually extremely difficult to deal with, not totally impossible but you will struggle and probably have to get a bit lucky.
Good Bans: Persephone, Thoth, Achilles, Merlin, Kukulkan, Ne Zha. You can ban Bacchus if you're really afraid of the pick but I think there are ways to deal with him.
Very strong picks, I recommend banning the top tier characters and then maybe looking to pick off a few here that you don't think your team can deal with reliably.
Heimdallr isn't out yet as of this update to the tierlist, but he will be a top contender Hunter-wise, I think.
If facing double warriors, highly recommend these mages over any lower, besides maybe Zeus. Your best bets are Merlin, Thoth, and Vulcan, followed slightly behind by Kuku, Isis, He Bo, and Scylla.
Still very strong and reliable gods, not so much as in the tier above.
Strong but lacking in certain aspects.
Niche picks, usually not good without certain other characters present in the comp.
From here down it's a free for all, I don't think they're bad, but I wouldn't pick them over the stuff above.
The bottom, unplayable at high elos, unless you're just amazing.