I was stating with her regular actions. You can put engine upgrade on her, but you won't have gyroscopic targeting which is nice if you want to be able to move your arc for free. I haven't seen her much with engine but that could just be the games I've played or watched, not speaking for everyone else
Well, I can see why you might not consider Ventress to be particularly effective, if you've never seen her built properly.
Good times.