I usually do the sword on hard with each character for the week, and I honestly notice very little difference between the hunter and the titan/warlock. The only part that the hunter helps with significantly (for me, anyway), is timing the first hit. If the group is lacking in dps, it's hard to time when to jump up when not invisible. However, if the group has enough dps to down Crota on the initial rocket volley, then the difference between the classes really is negligible imo. I should add that this goes for downing Crota in 3 swords. The hunter would make a huge difference going for 2 swords, of course.