I just checked them out- nice job! I liked Axel and the Heartless the best. I'm not sure that I agree with your dad's opinion that the best is in the middle, and regardless of where yours is I'm sure you did a great job!
Yes, yes it is. I've never seen Dexter, is it an anime?
First of all, I love the song Unbreakable, so great song choice! Okay, though the quality was worse in the second one, but I prefer it anyway because I think the clips that were used fit with the song better. I am going to say however, that I personally can think of scenes that I would have used instead of what these two videos used, so I don't think that either of them were especially outstanding.
Here's a Fullmetal Alchemist AMV for you!