I tried out dirty fighting from about level 40-49, and it wasn't a bad spec, but the set up time was killing me, literally. To get Wounding Shots to roll face, you had to hit your target with 3 very little damaging attacks. Now that might sound so bad, but if you are fighting a burst class, you are already going to be half dead by the time you can use wounding shots with it's full potential.
But that's only if you get targeted, if you manage to stay focus free, you can really do some serious damage before your target knows whats hit them.
Other than that, energy *can* be a problem, but only if you keep spamming your main bleeds without giving a little energy regen pause. Just a quick Flurry of Bolts or two between your high-energy build up attacks should keep you relatively high in energy.
