A detailed noise report seems a bit extreme, but if I'm buying a house, I'd like to have some idea what I'm getting into, and that includes train tracks nearby, barking dogs, etc.
Being in the Chicago suburbs, depending on the wind direction, we're in the flight path for O'Hare airport, one of the busiest in the country. It's rare, but when planes are coming in over our house every few minutes, it's noticeable. This happens maybe one or two days a month, tops, but if it was every day, I would want to know that ahead of time. As it happens, when we were looking at the house, we spent a little time outside checking it out, the backyard, etc., and it was very quiet the whole time. If it had been on one of the days when planes were flying over every few minutes, it might have been a different story.
One of the houses we looked at happened to be near a creek at the end of the street. We didn't even know it was there, but we happened to be checking out the house in the late afternoon, early evening when the mosquitos were out, and it was brutal. Just standing out front looking at the house and chatting with our agent, we were getting feasted upon. We finally looked around and noticed the creek, and wrote off that house. If it's like that every day during the summer, even if only for a few hours or whatever, forget it. I'd just as soon find another house.