writing style

This is turning out to be the most difficult book to read for me.  I'm not even sure if I really dislike the writing style, because sometimes it's funny, but something about it is making it seem a little less personal and therefore not as interesting as many of the other novels.  I feel like the narrator is kind of condescending and making fun of Mona, which makes sense since a lot of the stuff she says and does are a little iffy.  However, I can relate to falling into joking about stereotypes...and the voice of the narrator kind of reminds me of how I might talk about some of my past actions when contemplating what I've gone along with.

As you can probably tell I'm still conflicted with how I feel about this book, but I guess my question is, why do you think the narrator chose to write like this...do you like it or dislike it, and...do you think the story would be easier to relate to, or more accessible, if it was from Mona's point of view, or even from an unbiased narrator?