I can't actually think of any game campaigns that had no backer-only updates whatsoever? Transparency is important for backers, which is why there are updates in the first place, but it doesn't change anything if they're the only ones who can see a post. That only affects people who chose not to back it.
I think it would be unusual to go digging through Kickstarter logs to figure out whether a game is for you. Once the game is out, people can judge the quality themselves by reviews or demos.