I'm sure there was some resentment from other agencies that USDS helping them implied they didn't know what they were doing or something, but on HN it has basically been non-stop positive from what I've seen. Echos of the same things in this thread: that they wish they were in a position to sacrifice their pay in order to contribute meaningfully to the government where they have the most chance at impact.
IIUC Login.gov and the much more unified design system based on Material Design for government websites came from USDS.