-What specs have you had played with the most this expansion?
Both frost spec and unholy during heroic progress. Blood for some flex/soloing with a very low skill level playing that spec.
-In terms of actual effect on play, what has your experience with Soul Reaper been? Has it made a noticeable difference in what talents/glyphs you run, or even the spec that you play?
Before MoP we use to have a passive execute in frost spec. Passive-execute doesn't bring anything fun to our gameplay, and introducing an active execute that we need to manage should be more fun than a passive one. It gave blood and unholy an active execute ability, one they didn't have, and gave these spec a little fun thing to play with.
The 6s delay before it trigger is one of the fun part of the ability, by making us able to "precast" this first SR, trying to get it to tick just when the boss get under 35% hp.
But as it being an execute, I cannot stop myself from comparing it with other class execute abillity. I assume that SR was design this way in order to have a different feeling that other class one, but it has a lot of constraints : the CD itself, the rune cost, the delay effect, and the damage it proccur compare to other class execute with lower constraints (I have warrior execute in mind, mostly) doesn't feel right to me. The most constraint an execute have, the more damage it should bring compare to our others spells, and by the same logic, the least constraint an execute have, the least meaningfull using it should be.
The ressource cost would be fine if it was an RP dump. The rune cost make it hard to anticipate, as the basic UI cannot let us know if the spell is available if the rune you need for it is also on cooldown.
As for a spec per spec basis, the competition between SR and OB for 2H frost doesn't fit the "more fun gameplay while managing the execute phase". It always leave me frustrated whenever I have to choose between OB and SR. The fact that the stronger one isn't intuitive to know (il actually depend on the difference between the weapon you old and the overall ilvl you have) and having it compete with our KM stronger ability ruins the fun part it should bring, at least, for me.
For DW, the ability really lack of power. Failling at using it by smashing HB have never been really punitive, and is known to actually not matter at all in T16 heroic gear, as we mostly can play without it and not having a signicative loss in DPS, and having it actually making LESS damage than a HB when you're at high mastery lever isn't logical at all for an execute ability.
As for unholy and blood, the spell is ok overall. It hit significantly hard enough compare to our other unholy ability, and give us a nice damage boost without competing with our survival as blood.
I actually find it ironical that the spell feels ok for the 2 spec that didn't had any execute aspect pre-MoP and weird for the one that did.
As for a glyph, I actually never used it, but it have some niche, making it situationnal as a glyph should be, and I don't have much to say about it.