Another thread made me realize this might be very interesting. What was your highest rated message and what was the setting?
For me, I can't remember how many rates I actually got, but I think it was for a skeleton in Sinner's Rise, where I put down 'fatty'.
Runner up would be just after Executioner Chariot when I put down: 'Hurrah for horse!, death'.
Lastly, I also had one leading up to the stairs just after the room with Pate in Earthen Peak with the two pyromancers and the one grave warden where I put down 'Try stealth and then stabbing in the back'.
As for someone else's message, there are lots that were really helpful or funny. Too many to name. Most recently, after completing the game 4 times, I only finally figured out how to get on the other side of the door in Forest of the Fallen Giants in the room with the ballista's. Someone put down a message saying 'Try attacking and then listen carefully'. I attacked the door, heard a hollow grunt and he opened the door to attack me. 4 playthroughs long I had no idea where that door led and how to open it. Mind blown.