Personally, I dont' understand the direction some of the other reviews have taken. I enjoyed the book (As I had all the books preceeding) immensely.
Though Perv wasn't quite as bad as I would have expected it to be (Picture New York, only every fat half-drunk slob has the proportional strength to dismember you in seconds, magic is interwoven to technology, and food has a tendency to leave yoru bowl if you don't eat it quickly), it was still an interesting world for Skeeve to get lost in.
As for Skeeve, we get to see that beneath the exterior we see him try to build up in the previous novel, he's still nervous, inexperienced, and for once, finding himself without the security blanket of his friends that he has been able to rely on up to this novel. Fortunatly, the dumb luck that he possessed from page one of book one still remains, and he needs it.
Due to it's late nature in the seires, one would be recommended to read eariler novels first, but if it's your first time in the myth world, it can still be a fun book, if not one as understood (Several elements in this book will make much less sense).