I've read every Elton book going and I've thoroughly enjoyed every one of them (well maybe Blast from the past was a bit of an effort to read at times) but this effort goes straight to the bottom of the pile unfortunately.
As the reviewer "below" me mentions, it is quite an interesting idea on how shows like Pop Idol and X Factor work, and it does make me wonder if it really COULD be like that (Elton clearly thinks so) but apart from this then the characters are very dull. Ironically, the characters themselves raise this point in the book.
The first and last 80 pages or so are quite interesting but the middle bits really are a bit of an effort at times.
If you didn't know, Elton has written another satirical novel based on another reality TV show - Dead Famous - and I can highly recommend that. Unfortunately, the same cannot be said for Chart Throb.