Actually, obliterate is really not that bad. Especially if you wanna roll the lottery. Keep in mind that oblit actually does tend to do more dmg than HB due to it actually hitting twice. This becomes especially true with 2 set.
http://worldoflogs.com/reports/rt-3u...?s=9110&e=9552 Now I'm not the best geared DK in the world (by far not), but this is on a Lei Shi kill (in a guild who has some pretty big idiots, so my DPS performance won't be optimal due to having to compensate with idiots) and does show that it's not as bad as you make it out to be.
And keep in mind we banish all the elementals but one so I'm not cleaving or anything.
You can see that I get 31 Rime procs, which makes it really worth it to not ignore Oblit as much, IMO.
This is my gear if you care:
http://eu.battle.net/wow/en/characte...aiyla/advanced