My introduction to her was her Canopus in Archives series of novels which I liked.
The later novels seem to me to be good with a clunker now and then, but certainly not as bad as Bloom says. His big complaint in the way she depicts men.
There is also the bias against speculative fiction -- certainly unworthy of being awarded the Nobel Prize -- probably why Stanislaw Lem never won it though he is one the greatest writers of the 20th century. FIASCO is his masterpiece.
Brian