I just finished watching the movie and I enjoyed it! They all stayed friends in the end, no one became a typical "couple" like in most teen films. I loved the main characters personalities and I thought the actors did a great job! The effects were cool and I like how they entered the ship, those effects were especially interesting.
I'm getting the impression that people hate this movie because it stars people acting as teenagers. Honestly, just because it is about teens does not mean it is automatically bad.