Well, I can tell you this. I wasn't that thrilled with Insurgentes, either. This is a quite different listening experience.
Here is a suggestion.
If you can find some place where you can listen to the song Raider II in it's entirety, try that. It's an epic 24 minutes long, and usually I would become bored with such a long song, but there was so much going on it kept my interest throughout. If you are not blown away by that, I would say Grace For Drowning is not for you.