Well on PTR i made a Dok build with better gear that I will ever have. Perfect master work and lvl 100 Gylphs. My cooldown was so low I could spam Shadow Clone over and over and It farms T3 very good. T4 was a drag and bosses took way to long. for my taste but doable. However, its no long the same DOk I used to play as you max spin for 10 secs and the have to repeat the buff. So the Dok i loved with snapshotting is kinda dead but yeah if you like having the clone do all the damage then surely its possible if you play long enough to get good gear.