Just because there are a couple of duds made with Kickstarter doesn't mean the entire crowdfunding system is bad. Yes, it sucks if you had pledged on a project and the game/movie/whatever is either never released, or it turns out to be nothing what you expected. But that's the thing with Kickstarter, you're donating on a dream that an indie company wants to make real. It's not a pre-order shop, and while they can promise all they want to convince you that their project is going to be everything you hoped for - the reality is that you are not guaranteed that will be the case. You shouldn't pledge money on Kickstarter if you're not willing to take a risk, it's basically a gamble and you might lose big - or reap the rewards.
If more people realized that, I'm sure they wouldn't ask for refunds after a project turns out to be garbage - or is never released. However, "projects" that were created for the sole goal to scam people, is an entirely different story. Alas, since it was technically a donation - you can't do anything to get your money back... Unless you're willing to start a witch hunt and personally confront the scammers, if you can find them that is.
For every failure like Unsung Story, Yogventures, Clang, Mighty No. 9, there are excellent games that were created with Kickstarter such as Wasteland 2, Pillars of Eternity, Shovel Knight, Hyper Light Drifter, etc. The good far outweighs the bad, but the projects that failed are always getting more attention by the media/public than the ones which didn't. Why is that you ask? Because that's human nature, it's that simple.