I didn't read this book I listened

A couple friends say that I'm not getting the full experience because I bought the audio book. I don't know, I don't have a lot of spare time to sit and read but I have plenty of time to listen (driving to work, working out, cleaning the house, gaming). I enjoyed listening though, and to be honest I am thankful that I didn't have to try and determine how these words are supposed to sound lol. Also, since I'm using extra time I have I have listened to the book 3 times. I'll probably buy the audio book or Iron Flame too. What do you guys think, am I missing out?