Am I missing something about DRK?

[saber_alter]

-snip-

salted earth is a DoT like shadowflare.

MP management is trivial at best. numbers are slightly off though. dark arts normally costs 2 syphon strikes, and dark passenger costs 1. (i believe it is at least, i get around 884 mp per a syphon, and dark passenger costs 884 from what i remember. extra syphons are probably just to offset cost of Darkside)

more often then not, you won't be using DA+DP against bosses at least. normal mobs depending how much damage you take (even then a trashpull more than enough offsets that with blood price, especially at 4+ mobs).