Granted, I'm rolling a Merc now after having an Assassin and Powertech at 50 already because I want a pure range class. My Merc is only lvl 26. At this level, TM does feel a bit like spam simply because I have to wait every 5 levels to truly unlock the benefits that go along with it (aside from the armor reduction).
I try to mix in unloads, rail shots and fusion missles to maximize on what I can offer at this point, but recently switched to Pyro (my PowerTech was this build leveling, and loved it). I will probably wait until I unlock more talent points before switching back to Arsenal as right now I'm preferring mobility.
All that being said, nothing beats killing someone with an upgraded rocket punch, sending them flying, especially off a ledge