As I recall, Wave suffered from a poor reference implementation and such complexity that amateurs were unwilling to create their own. It also received a lot of

As I recall, Wave suffered from a poor reference implementation and such complexity that amateurs were unwilling to create their own. It also received a lot of bad publicity from branding and people who were unsure about what to make of it, but what killed it was that it never left beta (much more concretely than other Google products).