You're right, I almost forgot that between 3.1.2 and 3.3.5 Blood got nerfed and Unholy got buffed!
Oh wait, you didn't know that, did you?
I guess I may as well link patch notes to you since you'll be too lazy to find any facts to back up your argument and insist that you're right "because reasons".
http://wow.gamepedia.com/Patch_3.1.3
[Frost Presence]: Armor bonus is now 60% down from 80%.
http://wow.gamepedia.com/Patch_3.2.0
[Bloody Strikes]: This talent now provides 5/10/15% increased damage to [Blood Strike] instead of 15/30/45%.
[Dancing Rune Weapon]: This ability now has a fixed duration of 12 seconds (which can still be modified by its glyph) and a fixed cost of 60 runic power.
[Veteran of the Third War]: Stamina bonus reduced to 1/2/3%.
[Desolation]: New talent. This talent is in the position formerly occupied by Desecration. It causes Blood Strikes to increase all damage the death knight deals by 1/2/3/4/5% for 12 seconds.
[Scourge Strike]: Weapon damage bonus reduced to 40%, down from 45%. Damage increased by 10% per disease on the target, down from 11%.
[Unholy Blight]: This talent has been redesigned. It no longer deals damage to nearby targets. Instead, when you deal damage with Death Coil, the target will take periodic damage for 10 seconds equal to 20% of the damage done by Death Coil. This damage accumulates in the same way as Ignite and Deep Wounds.
http://wow.gamepedia.com/Patch_3.2.2
[Heart Strike]: Secondary targets of Heart Strike now take half as much damage.
[Subversion]: Now also increases the critical strike chance of [Scourge Strike] by 3/6/9%.
[Vampiric Blood]: Cooldown reduced to 1 minute and duration reduced to 10 seconds.
[Bone Shield]: This ability now has 3 charges instead of 4. Cooldown reduced to 1 minute.
[Dirge]: This talent no longer grants additional runic power from using [Obliterate].
[Gnaw]: This death knight ghoul ability now has a 1-minute cooldown.
http://wow.gamepedia.com/Patch_3.3.0
[Army of the Dead]: The cooldown on this ability has been reduced from 20 minutes to 10 minutes. Army Ghoul damage dropped by 50%. Cannot be used in Arenas.
[Night of the Dead]: Now reduces the damage your pet takes from area-of-effect damage by 45/90%, but no longer applies to area-of-effect damage caused by other players. In addition, this talent now reduces the cooldown of Army of the Dead by 2/4 minutes, down from 5/10 minutes.
[Scourge Strike]: Redesigned. The base ability now deals 50% weapon damage plus an additional amount as physical damage. However, for each disease the death knight has on the target, the target will take additional shadow damage equal to 25% of the physical damage done.
[Unholy Blight]: This talent now deals only 10% of [Death Coil] damage as a damage-over-time effect on the target.
http://wow.gamepedia.com/Patch_3.3.3
[Abomination's Might]: This effect is now passive instead of being a proc on certain strikes. Rank 1 is 5% attack power and Rank 2 is 10% attack power. The self strength buff remains unchanged.
[Will of the Necropolis]: There is no longer a cooldown on the frequency at which this talent can be activated. In addition, this ability can now also be triggered by damage which deals less than 5% of your health.
[Scourge Strike]: Now deals 70% weapon damage, plus 12% of physical damage done as shadow damage for each of the death knight's diseases on the target. The net result should be larger strikes with no diseases present, while maximum damage with all diseases applied to the target should stay the same.
Funny guy!