The upside is it always makes a statement. The downside is, its not always easy work. If wall paint is too hard, use it as an accent color instead.
Yellow painted walls have a nasty way of showing the color underneath it after a few years.
The great thing about yellow is that it works the best when it challenges its surroundings. Your room decorating ideas suddenly look better. Like milky yellow with clear blues.
There is at least one yellow that will speak to your muted gray or chocolate color scheme. Soft and pale or strong and mango vibrant. Sharp yellow against dark purples or rusts.
Yellow is incredibly versatile.