Dumplings and pastry made with suet microwave very well usually I find.
I think that people overdo it in the microwave as they were used to the hours and hours of steaming before to get the same results,this can make it unappetising.
Forgive me Lona and Clive for trying to advise the elders of the forum
(a bit like teaching granny how to blow eggs
) but dare I suggest that whichever of you makes a dumpling next that you split the mixture in half and steam half and microwave the other half but do it for only a few minutes at a time and leave it for 5 minutes before doing it for another minute then another minute etc until it is done.
That way you may find it is indeed as good as a traditionally steamed one