I've backed a bunch of Kickstarter, dating back to 2015, and very few delivered on time. A couple are super duper late now (I'm waiting on my Blacklist Fantasy Series 1 miniatures like many of us), and there are two I feel I'll be lucky if I ever see (a gelatinous cube shaped soap block full of dice I was hoping to have as a present for someone last Christmas and Brandon Dixon's Welcome to Tikor setting).
I'm sad about the minis because my kid and I had big plans for them when we ordered them, and also because they'd be perfect for the Tournament of Pigs box set Kickstarter that DID just deliver right on time. But I'll live. A bunch of backers are super pissed about/at Blacklist, but I just can't see the point to that. Of course, I backed their Altar Quest game, which delivered as promised, so they have more credibility to me than they do with some.
What sucks me into Kickstarter, and crowdfunding in general, is the stretch goals. Frankly, if a project doesn't have stretch goals, I'm unlikely to back it unless the cost of backing is is substantially lower than the cost of buying it retail when it comes out. But when there are a bunch of stretch goals that increase the value of the investment, well, you have my attention.
It's worked out well most of the time.