Thank you for the information. Another dumb question if you don't mind. What was your activity level? What was the layer underneathe made of?
Here is my guess. If the wetness was spotty or in a line it is usually from a seem or zipper. If it was consistant through out a large area like your back and shoulders, it is usually sweat. If it was raining hard and you were moving enough to sweat you "wetted out" which means the perspiration you generated had no where to go but sit on your skin and base layer and that is why you felt wet. Gore Tex or any other waterproof breathable does a pretty good job of "breathing" when the outside surface of the garment is dry because the water vapor/perspiration on the inside passes through and is evaporated out into the air. If it is raining and the outside of the garment is wet, then the water vapor/perspiration on the inside is going to stay inside because you can't push water vapor through water droplets.
So when it is raining or snowing hard the trick is not to perspire or to vent well enough to evaporate it.
If that is indeed what happened did the MTO50 really fail? Well, yes and no I guess. MTO50 has a shaved fleece nap exterior which when new has a pretty good DWR coating that beads up an sluffs off the water. As it ages, gets dirty, etc it looses it's water shedding ability and the fleece will get wet which serves to make the wetting out process occur quicker and worse. You can wash the jacket and revive the DWR with spray or wash in treatments. Works pretty good.
When you say it failed, I think that the Gore Tex laminate or the seems tape failed and the garment leaked. That just doesn't happen often and when it does, it is due to a manufacturing mistake or damage. I think you wetted out. So that is my bet on what happened but take it for what you paid for it.
I would love to be able to direct you to a better jacket but there is no fabric that I know of that will solve that problem. There is however, a waterproof hunting jacket that will breathe much better then Gore Tex but it is not here yet.
Regards
Wade
www.HardcoreOutdoor.com