Having played this game for just over a month now, I've come up with some tips that really help me, so I thought I would share one and see what you guys have come up with.
One I recently found: Ion shot is massively useful in Walker assault for both Reps and Imperials.
Need to shoot the walker?: ion shot.
Enemy put up a squad shield?: ion shot. A few bursts and it's down.
Enemy popped a personal shield to try and activate/deactivate an uplink?: ion shot, a few bursts and it's down, a few more and he's dead. I've been trying to find a good shield counter for awhile now (cycler rifle requires careful aim, impact grenades are even harder to use, homing shot takes way too long to lock on and fire, etc).
Turret farming your guys for kills (particularly on hoth)?: ion shot. A few bursts and it's done.
I now carry ion shot in one of my hands for all Walker assault matches. I'm considering carrying it for Drop Zone too.
Another tip is to forget about Ion Torpedo for anything except anti-AT-ST use or possible anti-X-Wing use. Ion shot does a much better job against pretty much everything you would want to use the torpedo against.
For the walker, use the pulse cannon instead and aim for the weakspot, you will actually do more damage than the torpedo will usually do (since it can't hit the weak point). Typically you can get +45 instead of +30.