If you look at the point on the floor where the rays 'bounce', you'll see that the rays are casting shadows too, that can't be associated with anything else in

If you look at the point on the floor where the rays 'bounce', you'll see that the rays are casting shadows too, that can't be associated with anything else in the scene. In any case, that's the only issue (however minor) I can see for the visual quality, and if that isn't what's being referred to, I have no idea what about the image 'looks bad'.