The NJO had its down points. VP was one of those in my view. However, the rest of the series had some incredible moments. Read it, enjoy it. Don't quit at least till you've read Traitor. That's the make it or break it point of the series. If you hate that one, you'll hate it all, but VP is a bad book to judge the series by. You fools who claim it doesn't exist b/c you hate it are just that: fools.
Be patient, though. A nineteen book series doesn't come to the end all in a flash and bang.