I just got my Powertech to 70, and he performs alright (Advanced Prototype spec'd), but the class is so squishy and there's so few abilities that it's hard to make an impact in pvp. It almost seems like Powertech is a beaten down, forgotten aspect of the game, barely anyone plays it, and after the massive nerfs it's gotten, it can barely hold its own. No one ever talks about it, no one ever acknoledges it.
Now, I know it has just gotten a buff with 5.6, but the buff is not nearly substantial enough to make it viable in PvP.
I'd also like to add that before level 60, the class was unplayable in PvP, as in I would die almost instantly and do ridiculously low amounts of damage (probably because I couldn't even stay alive long enough to inflict any damage, ha!)
My final thoughts: Powertech needs love, and It would be nice to be able play a badazz dude with a gun who falcon-punches people in PvP once again!