Its funny. I was excited about Metro 2033 and skeptical of 5th wave, and I was disappointed by metro 2033 and surprised by 5th wave.
I really liked the story in 5th wave. It's got a little teenage angst/romance in it, but it's not too awful.
What I'm worried about in the second book is what looks like a setup of a full on love triangle. I hope I'm wring about that (about to find out!)