I've rarely ever had Ubuntu bug reports be useful (and I follow up with more info when I'm asked) but can I really be annoyed? It's an open source product. I'm a software engineer. When it's important enjoy, I'll fix it. About the only useful thing is that other people also discuss it there.
Launchpad is useful as a single interface and Ubuntu-bug reports lots of info automatically so that's why I report there. Maybe I should use upstream.