First the infinite Flutter Jump, and now this. They're slipping.
EDIT: Well, there's 100%. That last star nearly cost me my sanity, but I finally got it (oh, and I didn't think the part with the flipping platforms and shockwaves was far and away the hardest part for me - I probably had the most deaths in the final area, as I suspected I would, but the real challenge is running through all of them back to back without checkpoints or margin for error). And I don't think I'll be playing SMG2 for about a year or so. It'll probably take that long for my hatred of the final level to simmer down - anyone who hasn't beaten it yet, do not underestimate that beast.
Also, was anyone else hoping that Starship Mario would attach to a giant mech body to defeat Bowser? Because I know I was. But all we got was a lousy admittedly epic boss battle.