A coworker suggested this book, which is the only reason I picked it up. It's not normally the type of book I'd read. 
 So, you're thinking, aliens? Pft. These aren't little green men from outerspace, though. Think more The Host than Enders Game. 
 The plot was a bit slow at times, dragging on in order to give more depth to the characters. There were quite a few cliches in here, but I won't spoil the book for you. You'll know it when you read it. 
 I really like Cassie, Cassiopeia not Cassidy or Cassandra. I found Evan really relate-able, but Zombie was a bit harder for me to buy into. (Okay, so I was team Zombie for a minute there, a half second, then I was over it.) 
 So, the plot. Aliens come and park their giant spaceship over our planet. They release 5 waves. (Oh hey, the title!) In the interest of no spoilers I'll just say they aren't fun waves for humanity. I think that I'd have really enjoyed a book chronicling the waves in a bit more detail, but I know there are already tons of books based on post-apocalyptic scenarios with each, so I understand why the author gave them each a few pages and then decided it was time to move on. 
 The book does some alternating between points of view with the main characters, one of my least favorite forms of story telling, before tying everything as together as possible with a neat little bow. 
 I can tell you that there aren't very many BIG surprises here for sci-fi readers. I could tell you what was pretty much going to happen next with very few exceptions just from how the author set everything up. 
 I liked it enough that I look forward to reading the next in the series but not so much that it'll be at the top of my list. Here's hoping for some bigger and better plot twists in book two!!