#0 - April 17, 2009, 11:58 p.m.
Originally, this ability was something you would use only situationally to heal yourself at a cost of damage. Since then we have redesigned the death knight class sufficiently to where Death Strike was a major rotational ability for Blood. Given how much the attack is hitting for, we think the amount of healing it provided was too much.
Healing still scales based on diseases and the damage is unchanged. Blood retains its other tools to heal.
UPDATE: We have since made another hotfix to just change the way the healing works completely. It now heals 5% of the death knight's health per disease on the target, up to a max of 15%. This should allow Frost and Unholy to benefit from Death Strike healing while letting Blood benefit from extra Death Strike damage. The tooltip will not reflect this change until we can patch the client.