I've said it before, but focusing on the funding method for most new RPG stuff this year is the wrong way to look at it. It's like saying a few years ago "Are you fed up of all these projects funded by bank loans?"
Kickstarter just happens to be the way these things are funded. The important thing is the product.
I'd agree that somebody who flies by, posts some ad copy and disappears into the night again pretty much defines the word "spam" - that's exactly what spam means. But there are also those who post something other than ad copy, and who stick around and discuss it. Those threads are useful, IMO.
And, more importantly, those threads are the ones that get the attention; the former just drop off the page. So there's a good way and a bad way to do it.