The plot doesn't suck. How can a plot THAT batshit crazy be anything other then pure gold?
Drakengard is one of those games that you sit your friends down to and have them play a wonderful drinking game with.
If something makes no ****ing sense, take a shot. If somebody in the group yells out "WHAT THE ****." everybody finishes their drink.
Depending on the ending you go for your group will all be dead by the end of the game, i assure you!
Especially the DDR boss ending.