From what I understand, the ones that should be skipped are Akebono, Etheral Pheonix, Rainbow, Obliverator, Graviton, and in general the harder gods.
Lionheart, Paradox, Ferox, Destiny, and sometimes Elidnis are easy wins. Also Neptune if you get a quint early.
Lionheart is really easy, just shield and he will deck himself out.
Most the gods can be beaten , but not all so...
Also, did you know Antimatter doubles as a quint? AI doesn't target anything with antimatter.
You always seem to get the hardest gods... Akebono, Graviton, AND Decay. Bad Luck =P