You could play as a Gryphindor (Ravenclaw in my case) and do all good, then go back and play as a Slytherin dark wizard. This was going to make it so that replay value would be fun. I was under the impression that you would be able to choose a "light" or "dark" side and go down a path or a dark wizard or stay as a good wizard. A lack of a Morality system: This is actually one of the biggest items I was disappointed with in this game.With that being said, there are several issues I have, after 100% the game with a platinum trophy and over 100 hours of game play.
The graphics are amazing and spent so much time just exploring Hogwarts and the lands and lore abound. The more people the better! Kept me on the edge of my seat every time and you really had to think on your feet. I never got tired of going into a heated battle. The fighting system is freaking awesome and super fun.
It lives up to the hype and I will recommend it to anyone. I will preface by saying that this game is amazing and I thoroughly enjoyed playing it.