I actually really liked this, but with reading the reviews (good and bad) I felt prepared for the change in the mythology. But I also like Percy Jackson which changed a few things as well.
The story was slow paced in some places and then picked up frequently but I was able to read it pretty evenly, going back maybe once or twice for clarity.
I liked the story and loved the romance (the whole distant powerful man I will make him love me thing)and got through it very quickly, I will keep reading.