The six rune bonus for this set gives regeneration every second. According to the GW2 wiki, the amount of healing (at level 80) is calculated as:
43 + (0.023 * Healing Power) per second
That means at 1000 healing power, you are receiving: 43 + 23 = 66/hp per second. That is incredibly low for a 6 rune bonus. Even a cheap food buff can give more.
Instead, I’d like to see the formula changed to something like this:
43 + (0.057 * Healing Power) per second. That means at 1000 healing, a person would receive 100/HP per second.