DW and I did Mouse Quest the same day as tink2020 and her DH (great to meet you!) and we noticed the same things. DW and I are both 30something, love puzzles, and we hauled butt around MK for two and a half hours and I really thought we were doing well. But the winning "team" of four adults who split up the clues beat us by 13 tokens. It's not for kids if you actually want to win. I will say that we'll certainly pay more attention to the details in the park now. A couple observations:
1) There are definitely more clues to find than you have time. 1/2 hour of the three hours is taken away by administrative stuff on the front and back end.
2) The organization of the clues is just fine...if you're sitting at a desk! Try managing 20+ envelopes, a folder, pens (which they failed to supply in our package!), and the clue sheets themselves while speed walking through the park!
3) With the crowds we had, there was no way we could have rode Pirates or Splash Mountain. A set of fastpasses for all the required rides would have been great. That, or make the game longer just to get in the rides.
4) If you have kids, this is not for you. They probably should have made a "family-only" event. The adult teams will generally dominate the game.
5) One of the consolation prizes is unique (you get a choice), but not at all worth $60. The game
may have cost them $10 per team.
6) Ignore their "rules" (they're more like guidelines really)

, and they'll only cost you more time you don't have. You can definitely get your solutions scored at the end of the game, and since you can't re-do anything you get wrong anyway, there's no point to get scored early in the game.
7) Some questions were wrongly phrased and other answers were no longer in the park at all. They tell you not to ask cast members because they don't know what the Disney Institute is doing, but sometimes that was the only way to get a clue. Some offered to help anyway.
8) The "grand prize" isn't all that grand. It's probably worth $100-150 total. There really should be a second and third place prize though.
9) Overall, it's a really good concept poorly executed. Not like the Disney quality entertainment expected. I'm going to catch fire for this comment but... If this is the way Disney Institute was run in the past, it's not surprising that you don't see them much nowadays.
Anyone who has already done this, PM me if you want to discuss "wrong" questions or what some of the answers were. Some clues were downright impossible!