I tend to take a negative view of anyone who believes that collectivism is inherently good. HP.
So you have a negative view of Jesus?
More seriously, Rauschenbusch promoted the Social Gospel, not the Socialist Gospel, tho unfortunately some libertarians seem to think that anything done to help people in general is socialist.
I'd need to read some of his work to reach a final conclusion, but judging by the Wikipedia article, he seems like a mixed bag. Certainly he came along at a time when social responsibility needed to be revitalized, but the way the article is written it sounds he overdid it, to the point of marginalizing the need for individual responsibility and the need for an individual connection to the Divine.