It's perfectly understandable to ask. In my opinion, the limited utility a damage spec powertech brings makes them less efficient than most other DPS classes. The damage of every damage class is good, but damage PT doesn't bring anything else to the table of interest.
Operatives - higher burst damage, innate run speed bonus, better capacity to interrupt damage, offhealing, combat stealth
Marauders - highest melee uptime, non-dispellable snare, great group utility (speed buff, defense buff, dmg buff)
Snipers & Mercenaries - Limited by line of sight, but incredibly high damage all based from range, knockbacks,
DPS Juggernauts - 7k aoe cleaves, charge, intervene, intercept
DPS Sorcerers - potentially as useless, large amounts of damage and utility, but typically not the kill leader (less meaningful damage than other dps counterparts), knockbacks
DPS Assassins - strong out of stealth bursting, force speed ability, stealth, knockbacks
Pyrotech - Survivability mechanism is heavy armor, lacks run speed bonus/closer, grapple is great for environmental damage/defense in HB, long cd stun (dart), short aoe stun (carbonize), ranged capacity but needs melee for full effectiveness.
edit: consistency
I'd also argue that Snipers and DPS sorcerers also have limited usefulness. Snipers immobility with cover is easy to exploit and sorcerers do a lot of small damage with a lack of true interrupts, making them not strong killers, but good at padding damage.