What
bigmouth said. I have a Gore-Tex rain shell that has been virtually useless from
day one.
However, if the Gore-Tex layer is protected by an outer layer to keep it clean and dry, the combination can work quite well. I have a pair of hunting gloves by Gates which I use on my motorcycle in the winter. These gloves have a soft inner layer, then Thinsulate for warmth, then the Gore-Tex, and finally an outer layer of tough camo something-or-other (not nylon, because it's silent when brushed). These are the only things I have found that will keep my hands dry, and thus warm, in a sleeting rain with a 75 mph wind chill. I even have a pair of neoprene diving gloves which do a great job in warm wet conditions, but they just can't hold the heat against that kind of convection. I haven't taken the gloves apart to find out why, but the inside stays dry even if the outer layer is soaked through, even when doing things (like working the clutch) that might bring the Gore-Tex in contact with the wet layer and cause osmosis.