This final before the FINAL installation of the Potter series kept me engaged, and entertained. It was one of the darker versions, but still fabulous. I would see it again.
My attention was captured from beginning to end. I enjoyed the effects, the cast, and the "twists" in the plot. It may not be a super serious Sci-Fi movie, but it was entertaining. NOTE: If you are a super Trekkie geek, don't overanalyze it.