No reviews? Let's give it a try. Ignoring the first, unneeded scene (the flash-forward), it starts off fairly well. There's the just married couple, then four friends (two couples one of which is no longer that), a (personally) cute goth-like girl (not so much, but close enough), a misterious stranger.. etc. From the very first moment the movie tries to establish that characters aren't one dimensional - with one of the stewardesses talking about her fiancee, the two couples aforementioned how they've been planning to go on this trip for so long, and so on.
However, beyond those few minutes.. it fails at expanding the characters any more, at least properly. You/we learn about two more things about two couples that aren't exactly a 'couple', and that's it. Yet, I didn't mind it. Sure, the movie could have benefited from more expended characters, but the story was more in the 'now', and the peril those characters find themselves in. As if you're watching it all happening right now, right this moment, and right in front of you.
The story itself isn't great, and it's different than I expected, but I liked it. There's not much scary stuff in here, and I'd put it under mystery/thriller.
All in all, the movie itself isn't great, but I thought it was enjoyable. If you like movies in airplanes, and you wouldn't just watch it to pick every little thing apart instead of just relaxing, and enjoying the ride, then go for it. Otherwise, you probably won't like.