It certainly dug into the details more than a lot of books of its genre, particularly at the start, but I think it's important because there are a lot of people in the story. It would be confusing if the book didn't give you time to read their names repeatedly and understand where they fit in and why. The end of the book, where there's this gigantic, chaotic battle scene would have been kind of "meh" if you didn't know and care about the people involved.
It reminds me of The Iliad (or is it the Aenid) in that way. The entire darned book is nothing but a list of the people, their lineage, their accomplishments and how they died in different, horrific ways. You wouldn't care if it was just a guy who died. But it's Bob, with a sword in his eye bleeding out on the field with his friend Claude at his side--master of spitballs, son of Floyd and Agnes, brother to the owner of the deli on the corner who makes the best pastrami sandwiches, husband to Myrtle, the beautiful mother to his two kids, George and Luanne, who chased the cat down the block into traffic last summer.