Sorry, I was using my avaition definition of 1 to 1 thrust to weight, which is thrust equal to the entire weight of the aircraft (or spacecraft), as in able to accelerate in the vertical, not a very common capability in aircraft. So, yes, the entire weight of the spacecraft needs to be lifted out of our gravity well. Does that mean you are saying that this can only be done with a spacecraft that is capable of producing more thrust than the entire spacecraft weighs?
Unfortunately any orbital space craft must produce better then 1/1 thrust to weight. a space craft that hurls itself on parabolic trajectories but never reaches orbit could make it to "space" without that but would have to use wings to do so (most would call it a plane). Basically if you want to get your craft out of the atmosphere it must get better then 1 to 1. This of course means the thruster probably needs significantly better then 1 to 1, but I thought I’d be generous.
Second, while thrust efficiency is a measure of thrust to electrical power in, this could easily mislead you to believe that the thruster is a transducer that converts electrical to kinetic energy. This is not true. M-E thrusters are actually transistors, that control the flow of gravinertial energy. This is important to keep in mind because when we look at higher efficiencies, we'll be tempted to think we have a violation of conservation, should we mistake a transistor for a transducer.
For us mechanical engineers it may be a gravity amplifier of sorts (this is what you meant by your insistence that it is a transistor?) but that doesn't matter for us. We think more like yay magic black box and see electricity flowing in one side and the box surging forward under its own mysterious forces. So the net effect we see is the craft electrical system losses X number of joules per second and the craft picks up Y amount of momentum per second, whatever the technical realities may be inside the magic box. Or I don't understand what the M-E thruster is supposed to do for us. Also if it does work this way how is it not a violation of conservation of momentum? And apologies to any other mechanical engineers out there if they take a more educated view about electronics and component parts then I do, sorry.