This seems great for creating smaller graphs as long as they don't get too complex. I'm kind of obsessed with node-based environments for DSP and media stuff (Reaktor, vvvv, and many others). Whenever my graphs attain some level of complexity, some features become very important such as selecting/operating on multiple nodes and most of all grouping. Rete.js doesn't seem to be quite there yet (no multi select? and Modules only hint at proper grouping), but it's definitely on the way.