I played Shadowrun Returns, but didn't back it. I think I got my twenty bucks worth, but not a whole lot more. I would have been disappointed in it had I backed it for fifty or a hundred.
I did back the Banner Saga. So far it hasn't grabbed me, but I haven't had time to give it a fair shot. I also only went in ten dollars on it, so it has a low bar to clear. Of my major pledges, four (Wasteland 2, Pillars of Eternity, Torment: Tides of Numenera and Divinity: Original Sin) seem to be shaping up fairly well, and one (Hero-U: Rogue to Redemption) is struggling.
I'm leaning towards backing this, but I'll have to examine the reward tiers more closely before deciding by how much. They seem to be off to a good start, but Kickstarters typically pull in the bulk of their money in the first and last few days with a long trough in between. That could be problematic in this case, since the Kickstarter is really to demonstrate strong interest among the prospective player base to reassure the real investor funding the development. A Kickstarter that blows past the threshold early on will be much more convincing than one that barely limps across the finish line at the last minute.