The End?

I have been reading a lot of YA series lately and I've noticed in some of them there seems to be no end. The story just continues from one book to the next with no resolution to the big conflict. I know that smaller conflicts or plot lines are solved but sometimes the books don't seem like they could be stand alone novels. Even the first novels in the series end with me wanting more of an ending. Maybe I'm just one of those people who likes their books wrapped up with a pretty bow while still establishing strong characters who I would want to read about even if they do solve all their problems in the first book. A complex cast of characters will always find more problems to get into, right? Some great examples of compelling series that kept my interest are Divergent and Mortal Instruments. Am I alone in wishing that some books would say To Be Continued instead of The End when the story doesn't actually end?