It really bothers you that they consider funded projects successfully funded? The goal of a kickstarter project is to raise money for the attempt. Once the money is raised, the kickstarter is successful. I think the site is pretty upfront about this.
And any additional judgement is out of their hands. They could allow backers to fill out a survey after the tentative delivery date has passed, and that might be interesting to see. But it's hard to deal with the delays inevitable in any project.
If you look at a project, it will say "Funded! This project successfully raised its funding goal on MMMM DD."
And again, saying just 'successful' is accurate, because a kickstarter is a fundraiser for a project that has independent life outside of that website. Some projects that take money through kickstarter will fail, but some that fail to raise money will find other funding sources and succeed.
And any additional judgement is out of their hands. They could allow backers to fill out a survey after the tentative delivery date has passed, and that might be interesting to see. But it's hard to deal with the delays inevitable in any project.