Ship Early. Ship Often.
It's an idea that I am forcing myself to adopt as it seems a little alien at the moment (Why would I want to show users an unfinished product??) but I've always been in two minds about landing pages being submitted on HN. I much prefer 'Show HN:' to be things I can play with.
How do you feel about clicking on a link and getting to a Landing Page with simply a 'Sign up for notifications' or 'connect to Facebook' form?
Virtually none of them have. After a few naive sign-ups I've learned better and never will again. Total waste of my time.
Does that answer your question?