This is commonly said but is simply untrue most of the time. Most of the time people are best off without a centre channel. The only reasonable scenario I can think of where a centre is better is if you have listeners really close to the screen or spread very wide, _and_ you are prepared to invest in a centre at least as good as if not better than your existing L/R speakers _and_ your centre has really good horizontal dispersion. So basically a dedicated home theatre setup with multiple rows of listeners.