Just because the classes will be able to do a lot of similar things you think you can't make yourself different? Did you forget that even if the 3 classes were completely different and you choose one then you're still the same at 33% of players. It's how you play, where you explore, what skills and weapons you choose that ultimately decides your Destiny. Open your mind a little and you will surely be amazed. The reason they want everyone to pretty much be able to do most things is so that people don't play 12 hours with their guy and realize they like the Warlocks class more than the Hunter. This lets you be whoever you want to be no matter what class you are, through the infinite amount of choices you can make throughout your journey.