The reviews I've seen seem to have a trend. They love the gameplay or recommend the game, and then give it a not-great score.
Because of the broken multiplayer.
From 1up review:
"At the moment I'm writing this, Demigod's multiplayer is just plain busted"
"Personally, I'm looking forward to playing more when that shining day arrives, at which point I'll be re-reviewing the thing."
Let's hope so!