It seems like every time DRK/SAM comes up on this board, most people don't seem to like it. I was wondering if someone could explain the reasoning behind this attitude. Here is my thinking on why I prefer DRK/SAM for merit parties (not speaking of anything other than merit parties right now ^^).
If I merit as DRK/WAR, I do more damage than DRK/SAM, but I pull hate frequently and require a lot of curing.
If I merit as DRK/NIN, then I do less damage than DRK/SAM. As a consequence I don't pull hate as much but the shadows are nice for things like Puk's AOE move.
If I merit as DRK/SAM, I do damage nearly as good as I do on DRK/WAR. When I pull hate I can flip over to Seigan/Third Eye. I might get hit once as I'm doing it, but only once. For most of what I'm casting in merit, the magic casting penalty doesn't really hurt me all that much (if I'm not in a position to cancel Hasso/Seigan before casting).
To me, it seems like DRK/SAM is a great middle ground for merits, striking a balance between doing damage to the mob and damage mitigation.