(Mods, I figured the Dragon Strike room was appropriate for this thread, but feel free to move it if there's a better place)
We've tried Quest 1: Rescue of Griz and here's what we thought: Boooooring. Especially when the heroes have to trek across the entire upper and left corridors with no monsters, doors, anything.

(This bit could probably be improved, however, by moving those last two rooms to the upper left section, instead of the lower left section)
The "old lady with the crossbow" situation didn't really play well within the mechanics of HeroQuest, but I'll admit part of that may have been my GMing. I basically presented the situation to the hero who opened her door and asked, "How do you interact with her?" He stepped one space into the room and asked if she had anything for him. I responded with the "Leave my stuff be" and that was it. Again, boooooring.
The heroes eventually schlepped their way to Griz's room, where the Manscorpion laid waste to all of them. I felt bad about slaughtering my heroes in an "unofficial quest" so I decided to let them keep their characters in the official storyline and that "this quest had all been a dream."
Additionally, I don't like having both the Gargoyle and the Manscorpion in this quest. The reveal of the first big monster makes the reveal of the second big monster much less dramatic. I tried to come up with a thematic reason for them to both be there, but I cannot. I imagine the only reason for the Gargoyle is because there was a Dragon Strike gargoyle in the original adventure.
So, that's my take on the Rescue of Griz. Frankly, I could tell just by looking at the map and the quest notes that this would not be the most exciting adventure, but I still wanted to give it a try. Hopefully the others are more fun.