I cried when they said goodbye to Cedric in the maze, knowing he was going off to his death. That was a very touching moment.
I just think time travel plots always create more problems and plot holes than the story is worth. While the time turner stuff was fun, and brought back great nolstagic feelings, I also wish the story was more about the wizarding world as a whole. But I won't complain, because it's Harry Potter and that's good enough for me.