It's in the fence between good and bad. As for the plot, it makes sense for the gods to act how they are being all high and mighty, however the way the gods are portrayed visually makes you want to turn off the screen. For example, Zeus and Thor look completely off but I imagine that's what they intended to do differently for sake of plot. What's good is the depth of each human challenger.
Its hard to call this anime good but I don't think it's bad either.