Sleeping systems - bags, pads, matts, liners

The last tour I did in the Outer Hebrides I just barely managed to keep my sleeping bag dry-ish. But my tent was permanently wet, my clothes were permanently wet, I was permanently wet, my rollmat was permanently wet... I am convinced that in that situation a down bag is worse; whilst it might weigh less initially it will accumulate water and eventually begin to approach the same weight as a synthetic bag, and obviously is much worse at insulating you when it is wet. So any advantage that down has is lost. I was glad of my years-old cheapo Mountain Warehouse synthetic bag even though it did weigh a kilo.