Personally I thought that the second half of OotA was by far the weaker part. There is just not much to it for an arc that is supposed to take characters from 8th to 15th level. I thought it had a couple of great scenes, but just didn't have enough actual material to support what was trying to do. Obviously if you are familiar with the adventure and think it is great, go for it! But if you are just reading the overview and noticing the levels match up, I would recommend taking a closer look and figuring out if the actual adventure is going to work for your group.