Originally Posted by
Maxweii
Festerblight is all but dead in 5.4 so you don't much have to worry about it being a dot spec. Unholy as a normal spec though is pretty awesome, you have a lot of nice powerful abilities, something that Frost lacks. Frost is fun as well, but you are more relying on your pure rotation compared to "hey pop a CD look at it's effect", which to me I really don't like.
Since 5.4 is just around the corner, this is how they are breaking down so far (in terms of dps rotations since you are interested in that).
DW Frost - Lots of HB, Frost Strike damage
2h Frost - Dem Obliterates
Unholy - Back to normal Unholy, powerful dots, fun shadow damage.