During the time of Mahabharata, did the society consider polyandry or fraternal polyandry a condemned or shameful act?
A women should marry only a single person according to Mahabharat.
They used to go about freely, enjoying themselves as best as they liked ... they did not then adhere to their husbands faithfully, and yet, O handsome one, they were not regarded sinful, ... The present practice, however (of women's being confined to one husband for life) hath been established but lately. Women transgressing the limits assigned by the Rishi became guilty of slaying the embryo.
Karna said during Vastraharan to Vikarna.
O son of the Kuru race, the gods had ordained only one husband for one women. This Draupadi however hath many husbands. Therefore, certain it is that she is an unchaste women.