Burning is highest condition dmg with the shortest duration. There is a smaller window for the enemy to cleanse it before it ticks for full dmg. You would have to keep a minimum 7 stack bleed to compete with it in terms of dmg.
The torch 5 combo field can be easily exploited by the 3 shortbow 100% projectile finishers (skills 3,4,5) applying 1 sec of burning for every finisher landed. The fire aura from the sword leap lasts for 5 secs and burns the foe for every second you’re near him. After leaping follow up with the sword AA, which leaps to and cripples your foe, for maximium benefit.
The torch 5 is an Area of Denial tool and in combination with traps can force most professions/specs off point. Drop the fire field in the middle of a point and watch it go to work. Allies and pets can combo off the field leading to even bigger dmg.