Not going to rate this one formally, though when I stopped somewhere in the 70s page range, I would give it a 2.5. I began this as an interim story to my boys (14 and 12), while we waited for the title we REALLY wanted toread to arrive at our library. 
 I didn't find the jokes to be funny, or the story compelling. I did like (as will plenty of the target audience) the inclusion of so many drawings; this added some flavor. Even though I never finished it, both of my boys did on their own, and the 12 year old tells me it was pretty good.