Yikes!
I feel the same way about The 5th Wave as I do about Nandos - I'm just not sure if I like it. Sure, I like the smell in there and everyone is always going on and on and on about how great it is. But then you get there and there's always this really boring and awkward wait because for some reason they thought it was a good idea to serve food partly canteen style and partly table service. Whoever dreamed that up was kidding themselves when they thought it would make a pleasant dining experience. Half your food, which was inexplicably given to you at the counter, sits and gets cold on the table, while you wait for your main meal to be brought to you by the server, you know - the good stuff, the stuff you went in there to eat in the first place. All the while that plate of lumpy mashed potatoes just stares up at you, saying "You picked me. I know you felt you had to because I came along in the meal deal, but you picked me all the same so eat me and enjoy me!"
What I'm trying to say is that parts of The 5th Wave reminds me of that sad plate of mashed potatoes - I didn't want it, but it's there anyway sitting right beside the good stuff and colouring my opinion of the thing as a whole. Cassie and Evan's relationship is my mashed potatoes - unexpected, stodgy to get through, bland and just a little bit sickening.