Neobr10: I do agree that Kickstarter is not a pre-order, but the fact is that people donate money out of good will because they TRUST that the project will be made. Kickstarter pledging is based on trust. Double Fine has broken this "trust" backers had put into them. People have valid reasons to be upset. They donated money on a project because they believed in Tim Schafer's ability to come up with a great game. The project was way overfunded yet it's struggling to be completed, that's a reasonable reason for backers to be upset.
I can understand being upset, I just think it mostly comes out of not trying to get the real picture or because the up front expectations were wrong. People who thought the game would be finished on the original date have no clue. People who complain that DF hasn't communicated previously well or taken their opinion into consideration when they didn't make any effort to listed to DF or communicate with it don't really have grounds for complaints.
In particular I don't understand people who complain that they won't be getting their game when in fact DF is doing the best it can to give them a game, is taking steps to ensure that, and the end game will have a larger scope.
There are grounds for complaint, it's just that most of what I see is bogus. It's some backers freaking out without good reason and outsiders adding to the flame.
But really, all the projects I back are with the understanding that my money might go down the drain. Sure I'd be disappointed, and if that regularly happens I'll be less likely to pledge in general, but I never come to a project expecting that it will arrive on time and end up perfect. I hope it ends well, and if it does and I enjoy it then that's great. In the case of DF I wasn't all that excited until I saw the recent game clips.