Okay, I didn't give the first book a lot of slack but the second and third books were really fun! I could not put them down and had to read the third right after finishing the second. I didn't get a lot of anything else done for a few days until I had come to the end.
There was lots of adventure and creativity in these last two. They were surprising and not so shallow as the first book, Uglies.
If you haven't finished the series I recommend that you do. Pretties and Specials were worth the read.
Broken Books, Healing Books
Also there is a fourth book Extras that takes place in Japan or something. I think I will skip that one. I am done with this whole world of Utopias for a while.