I don't see, or hear, a problem with the trailer narration at all. I thought it was spot on. What did you expect, that she would be sobbing or sound scared? It's purely meant to give a quick resume of the timeline and to bring people up to speed since the story takes place with the 5th wave.
And I don't think it's fair to compare a trailer round-up with the perfect intro of LOTR, which firstly is one of the most epic intros of all time, but also part of the movie. You should compare it to other trailers, and if you listen to voice-overs for most trailers you will quickly realise that they really suck, and many times it's just generic deep voice and not even an actor from the movie.
>The rest of the trailer was also far too generic and didn't really offer anything new or interesting
Yes, we have all seen sci-fi movies and alien invasion movies before en masse, so from that perspective, it is hard for any new Sci-Fi alien invation movie to bring something new to the table.
Now, I havn't read the books, mind you, so I might be totally wrong here and speaks from what I just saw from the trailer (and the few tid-bits I've overheard), but for one thing, that is new
I think is the part that Cassie does not seem to be out to save humanity and clear the world of the aliens (the others). And while we do get a hint of romance, it's my impression, that the focus is more on Cassie surviving and trying to find and save her brother.
Not to mention, that Cassie is a female lead, which is also rather new
And thinking about that (survival and finding brother), I thought the trailer was pretty damn well put together and not only showed a mad max
kinda ruined world after the alien destructions, tough psychological survival (trust no one) and actually more action, that I had expected.