As rule, I'm not a big fan of sequels. Sure, there are a few really great sequels, trilogies, and series that I absolutely love, but I'm always hesitant to pick up a book that I know is going to turn into a series.
Especially if it's contemporary.
WAIT. LET ME EXPLAIN. YOU KNOW I LOVE CONTEMPORARY.
Sci-fi and dystopian (especially dystopian) is different; lots of times the story contained in a dystopian novel is too big to tell in one book. These books have world-building, good guys and bad guys, epic battles, and, very frequently, world-changing events. The need a lot of space. A lot of pages. More than one book.
But contemporary novels? The stories in them, more often than not, are one-shots. They're about falling in love or falling apart or finding yourself or losing someone else. They're about family, friends, school, life - and the events that change us, shape us, or make us. These stories are incredible, but they fit in one book. Much of contemporary YA is writing about a person, event, or time, that really matters to the protagonist. Someone or something that changes them, teaches them, or makes them into someone better than they were before. Oftentimes it seems like turning these fabulous stand-alone stories into series just diminishes the impact. It drags out a story that shouldn't keep going. A story that works so great alone.
And it makes me sad to see so many perfectly wonderful stand-alones being turned into or planned as series. Yes, there are fabulous contemporary series; there are stories that need more than one book to be told and worlds where, even if the story can be contained in one book, it's such fun to read more. But there are also a lot of series that shouldn't be, and personally I'm not averse to reading the first book and - even if I love it - stopping there. Because sometimes that's what needs to happen.