I was also not impressed with my stay at that property, though not because of the noise. The view was of the office building across the street, which was so bright from the lights that shone all night that it was hard to get the room dark.
I would also expect to get, at the very least, a free night there because of the noise, though you might not want to return there. I recommend the Westin Harbor Castle for future Toronto visits. As a Gold member, I was upgraded to a high level floor with a beautiful water view.