Part of the success or failure of a movie is whether it can create a plausible sense of time and place. "Roller-coaster" succeeds. It effectively employs scenes that, under different circumstances, would disparagingly be called overused or uninspired, but here they seem fresh and compelling. It reminded me a lot of "Hurricane Streets".
Roller-coaster is the story of five seemingly aimless, conflicted teens from a group home in Vancouver who break into a defunct amusement park. Each of them has a problem or a secret the movie will eventually reveal. Mix all of this with the teens' confrontations with a security guard who at first bullies and torments them. Later it appears that, whether out of boredom or a change of heart, he befriends them. However, his kindness is just a means to an end.
Too many movies are guilty of playing down to the audience. When they show angry teens, the emotion seems contrived. However, "Roller-coaster" manages to make the anger, frustration, confusion, and boredom of growing up seem real. You develop sympathy for the characters because they don't come across as spoiled or irritatingly self-pitying.
Epilogue (added March 14, 2006:) I rented Roller-coaster this past weekend and was amazed at how faulty my memory is. Several years had gone by between the time I first watched the movie and did my review. Roller-coaster is actually better than I remembered. I would now say that it is in the same league as the incredible movie, "Mean Creek".