People generally hate things that try to steal their attention away from the thing they are trying to focus on. It doesn't matter if it's a scrolling marquee,

People generally hate things that try to steal their attention away from the thing they are trying to focus on. It doesn't matter if it's a scrolling marquee, an animated gif, some Flash, a movie, a popup, a cookie banner, etc... Generally, moving/animated things grab your attention and people find it annoying.