Braid was definitely worth five cups of Starbucks coffee, which is my new standard of measurement. I never finished the game, but I didn't feel ripped off, either.
Not that big a fan of Jonathan blow though. His "official walkthrough" for Braid was the height of designer conceit:
You'll eventually get it, and you'll feel really smart when you do.spoiler (click to show/hide)
Only the most self-centered game designers can assume that their players will know what the designer was thinking.