Oh really, let's look at what the big kickstarters have brought us (this is as far as I know based on Codex comments, with regards to the 3D games which I don't play):
1. Divinity Original Sin asked for money to complete and polish their game but still released a product completely unfinished beyond Cyseal.
2. Wasteland 2 promised a tactical RPG that turned out to have no other tactic than "shoot", but turned out to be a detailed container opener simulator.
3. Pillars of Shitternity promised an IE style game combining the best of BG, IWD and PST but turned out to be a hollow single player World of Warcraft clone made by interns.
4. Shadowrun Returns promised an old school RPG but turned out to be a simplistic tablet game.
5. Dead State turned out to be an incomplete, buggy mess.
6. Haven't really managed to comprehend why, but Banner Saga turned out to be disappointing for most too (possibly because the game implemented actual consequences which butthurt lots of people, but perhaps there were promises here too that were undelivered).
The only games that have underpromised but way overdelivered not only in terms of graphics and music but also in terms of systems and content (and even quality backer rewards) have been smaller projects like Lords of Xulima and Serpent in the Staglands. These are the sort of projects that should actually be on Kickstarter, not the sequence of farces launched by the big studios which have destroyed confidence in the system.
5 of those six games you mentioned are all still being worked on. HBS seems to keep incrementally improving with each release. I'll be interested to see the shape POE is in after 2 expansions and a simple mod to remove some of the backer NPCs. Both Wasteland 2 and Original Sin are getting enhanced editions. Dead State has had huge work on bugs and difficulty since release.
The biggest problem seems to be delivering a finished product for these Kickstarters.