For example, the build ive been running on my dervish is, i think, extremely basic... put up a few enchants, then attack/remove them with pious assault... well, i run 12 mysticism, and i have JUST BARELY enough energy to put up 4 enchants then spam pious assault 4 times (and when i say barely, i mean BARELY with a capital B)... i dont think any of the other professions require you to run 12 in their primary line just to get by on a very basic build.
...and thats just addressing the energy!
I feel, like many of you, that 1 hp per lvl in mysticism is simply not enough. with only 70 al, the dervish is quite squishy in close combat (yes, even with the various debuffs that your enchants provide against your foes). The only reason that people were so indestructible on dervishes during the original pvp preview was because foes werent really trying to counter them... there are any number of completely evil things you can do to a dervish with a mesmer, necro, or even a ranger >
...and finally, i would like to agree with Twicky, and say that if you dont think the dervish was over-nerfed... go kill an archer NPC in a GvG with a dervish; and then with a warrior (or ranger, or assassin, or ele, or mesmer...) :P