The Website I found the criticism , it says it's in his book , Riddles of Hinduism
Rama’s birth is thus accompanied by general debauchery if not in his case certainly in the case of his associates. His marriage to Sita is not above comment. According to Buddha Ramayana, Sita was the sister of Rama, both were the children of Dasharatha.
The story in the Buddha Ramayana is natural and not inconsistent with the Aryan rules of marriage. If the story is true, then Rama’s marriage to Sita is no ideal to be copied.
This murder of Vali is the greatest blot on the character of Rama. It was a crime which was thoroughly unprovoked, for Vali had no quarrel with Rama. It was a most cowardly act, for Vali was unarmed. It was a planned and premeditated murder.
That means that Sita preferred to die rather than return to Rama who had behaved no better than a brute. Such is the tragedy of Sita and the crime of Rama the God.
Rama was not a teetotaler. He drank liquor copiously and Valmiki records that Rama saw to it that Sita joined with him in his drinking bouts. From the description of the Zenana of Rama as given by Valmiki it was by no means a mean thing. There were Apsaras, Uraga and Kinnari accomplished in dancing and singing. There were other beautiful women brought from different parts. Rama sat in the midst of these women drinking and dancing. They pleased Rama and Rama garlanded them. Valmiki calls Ram as a ‘Prince among women’s men’. This was not a day’s affair. It was a regular course of his life.