The Weimar Constitution was a major document that was landmark for its time. It provided a democratic system, and allowed for key freedoms (trade unions, vote for men and women etc) that were not allowed for in many other countries around the world. It was praised by many foreign observers for being a document that aimed for the protection of human rights. Of course there were flaws - such as being 'too democratic' with the system of proportional representation.
The 'Golden Age' of the Streseman Era was said to have had positives that were quite superficial (Webb). However, these were positives, superficial or not. Cultural advancements were made in cinema, literature, architecture, especially in the younger generations. This cultural freedom arguably set a precedent for youth uprisings against the Nazis from 1933 onwards (Edelweiss Pirates, Swing Youth). The Nazi era showed that public works programs are instrumental in building up the economy (and preparing for war is pretty helpful too, I guess, in that respect). These positives are often overlooked when compared to the horrors of the Nazi regime. So yeah... there are some positives.