Yes, they are worth of playing now, especially after new Gods came out and AI was improved. New Gods are not easy at all and some Gods learned to use Eternity, so some games could take forever to win those. But Half Bloods are still often beatable with the usual Graboid Rush (like 14 Towers, Graboids, Shriekers and 4 Basilisk Bloods) or Mono-Darkness (with some Syphons to kill Otys and Maxwells), Mono-Aether or Fractal-Chargers, or Fire stall (something like 6 Shards and Bolts, 2-3 Fahrenheits and Shields, maybe 1-2 Explosions) or Mono-Light or Flying Owls (with Shards and Air Nymphs) or Dune Scorpio-Pharaoh Decks with Shards or Death Deck (with Cats) There are many possibilities. Useing quick Rainbows, something like this
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6qq 6qq 6qq 6qq 6qq 6qq 6qq 6u3 6u3 6u3 6u3 6u3 6u3 6u7 6u7 71b 74b 77f 7ah 7am 7do 7do 7gv 7k2 7n3 7q5 7t8 7t9 80h 80h 8pj
is a possibility too.
Besides, Ai5 has great variety of decks and it gives upgraded cards sometimes.
Just in case, to avoid deckouts, a bit bigger version of this deck (might be complitely unoriginal, I don't know):
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6qq 6qq 6qq 6qq 6qq 6qq 6qq 6u3 6u3 6u3 6u3 6u3 6u3 6u7 6u7 71b 74b 77f 77g 7ah 7am 7do 7gv 7gv 7k6 7k6 7n3 7q5 7q5 7t8 7t9 80h 80h 8pj
??? are Sanctuaries