I stick with a single point AF as that way I know where the camera is focussing and gives me consistent, predictable performance. When people show me poor images from their cameras its frequently because the camera has defaulted to an auto-focus point and simply not focussed on the correct place. I've experimented with auto-AF points on my cameras but I've found the performance erratic, sometimes the camera will get it right sometimes not which just isn't good enough.
The only time I'd consider using auto-Af points is when there is a single relatively small target with a low contrast backdrop such as a plane in the sky, that way the AF is likely to get it right as only one or two of the AF points is going to be giving a response back which means it can't lock onto the wrong area.
John