I have been playing since day 1 and had only 1 character (a warlock) until January. I decided to start another one (a hunter)and was shocked at how different it was to do these missions again. You have no hitting power and can't take any damage either. It was fun the 1st time through to buy dozens of weapons from the Gunsmith and constantly upgrading armor but it kinda sucked doing it again. That being said there should be a more streamlined process to creating additional characters. It took me about 14 hours to get to level 20 and a bunch more to finally get to level 32. It was such a hassle that when I decided to make a 3rd character I went with another warlock so I did not have to grind to get all the gear. I just passed the new one all of the hand me downs from my first warlock when he got to level 20. It would be interesting if there were different options (paths) to take when redoing missions that would change things up but I don't see that ever happening.