GR00T: For myself, I still pick and choose a few projects to back and so far it's been a good experience.
Out of curiosity: Which pledge tier do you usually go for? Lower end (digital copy of the game only), mid-range (physical stuff) or higher tiers, or does it vary? Most of the people I've talked to that still do Kickstarter usually went with the lower pledge tiers, that seems to be the secret to not getting overly frustrated.
GR00T: But you can also have bad experiences when just buying games (bad devs not supporting them, or games being broken, or you just plain don't like the game).
Tell me about it! ;P
Still, buying the finished game from gog does have some distinct advantages.
First, I usually can get my games pretty cheap here while they're on sale, so it doesn't hurt as much when I get a dud. I pay something like $2-$3 on average per game. Occasionally I get a dud for $10+, but hey, live and learn.
But most importantly, buying from gog does give you an extra layer of protection. If a game is unsupported or broken, I can go ahead and contact gog support and ask for a refund. And gog is usually pretty lenient about refunds. In the case of Perception (another Kickstarter game I'm glad I didn't back), the game is both broken AND the devs don't bother to fix it (well, not on gog...). But at least I got my money back. Feels good to buy from a store that, when all else fails, has your back .
Compare that to "pre-ordering"/backing on Kickstarter. You're 100% at the mercy of the project creator. Kickstarter aren't gonna get involved, no matter how bad things get. Unless the project creator agrees to give you a refund, you're utterly screwed.