From what I've come to understand, the basic gist of the soul-maker buffs and links is that, when all combined, you get:
+20% attack
+10% crit power
+10% vigor/haste
-10% damage
on 5 people, assuming everyone stays within range.
if we assume 10% vigor/haste means that you get the same amount of attacks out in 9 minutes than you would without it in 10 minutes, then that's a further ~11% increase in DPS, making 31% attack buff. 10% crit is tricky to calculate because of how crit varies from char to char, but if we can assume the average person has 10-30% crit rate, attack can further be calculated as having a 1-3% increase in the long run as well, making 32-34% boosted attack power.
If an SM were to replace a DPS in a regular dungeon, then this alone would not replace the third DPS, it would only add about 32-34% attack power to the total DPS output by 2 DPS, when a 50% increase in DPS output by the 2 remaining DPS is necessary to make the DPS output by an SM and 2 DPS equal to 3 DPS. However, this does not include the fact that -10% damage is given to all, and all of this applies to the main healer and tank as well. Plus, with an SM DPS build (aside from maxing out the Link/Buff skills), the SM might very well be able to nearly replace the lost 3rd DPS anyways? I'm not sure exactly how terrible the DPS of an SM is and if 32-34% increased attack is enough to make up for the lack of DPS, but if you add the fact that DPS is nearly made up with buffs as it is it's looking almost as if even with the lack of DPS a soul maker is even better than having a 3rd DPS?
Granted, this is all ignoring w/e buff is lost by w/e potential DPS might have been used in the first place.
It's definitely a very interesting class that's hard to do anything but guesstimate on. :3
Now to analyze the DPS. Even if Immunity is only usable for every 10 seconds for 2 minutes every 10 minutes, that's an immense payload at the beginning of every boss fight I assume. I'm assuming the stats of an SM don't excel in making that 105% as worth it as you'd think, but that's 315% attack every 36 seconds. (assuming you count casting time as well, and ignoring the bonuses of vigor/haste from all your buffs which would surely help a lot) Aside from this you still get Sacrifice every 30 seconds for 115% damage. This is also all ignoring the fact that it's all multiplied by an additional 30% during those 2 minutes due to Awakening, aside from the additional attacks you will get in that time from the 15% "acceleration," and the fantastic bonus you'd get of healing everyone a lil' bit whenever you crit.
So here's what I was thinking: How about going for some serious burst damage at the beginning of that battle for the first 2 minutes, healing in-between 10-second cooldowns for Immunity, and then after the 2 minutes just focusing on healing and buffing? The following build would work for the whole DPS part (however has only 3 skill points left for any healing):
Perhaps it would be better to just put the remaining skill points into some basic DPS skills and go full DPS aside from buffs? Frankly if an SM can get 5 whole DPS buffed in a raid I'd think it'd actually be better off replacing a DPS altogether. (granted, this takes quite some co-ordination, especially if the DPS is split between ranged and non-ranged, and if it's difficult to control who gets the buffs exactly. Even if you could get everyone to calm down and stand in the right place to get the SM buff right before the fight, if the fight lasts more than 5 minutes you end up losing a perfect DPS buffing. Of course, just rebuffing around the ranged and giving the healers a bonus isn't necessarily bad either.)
Overall I think that in the end it just seems that, under the ideal conditions, an SM can actually make a party/raid even more OP than having 3 DPS instead of 1 SM and 2 DPS.
What, this build would take forever to level? You're talking to someone who's solo-leveled and FS Priest to 50. Not sure about a lack of healing skills that will keep me from ever needing to use pots tbh, but...
Aside from that, all new chars for a while now have gotten a skill reset scroll at lvl 35, so I may end up doing a build better for leveling at 25 and switch to this build at 50.
In conclusion, I've done the math and, even with the astounding amount of things that could vary and can't be calculated easily, it seems like an SM would be one of the best DPS out there for dungeon/raid bosses simply because it can boost other DPS and itself so much, and I wanna hear your opinions on whether I, someone who's had no actual experience playing an SM yet, am right or totally missing something. 
