Thanks useful information: 
the only times I will go to full manual is if the camera is doing something I don't want it too or in the studio as I use my studio heads with radio triggers in manual ..outside of the studio its always a light metering issue that will make me switch to "M".... typically shooting night basketball in a outdoor crt.....as you pan around large portion of the background go to black..as the evaluative metering needs to use the dark areas in it exposure equation the shutter speed drops ...I cant spot meter as the players are moving too quick...so I meter in AV mode at the aperture I want..normally taking a light reading from the crt surface..then go to M using that aperture and the shutter speed the camera says I needed { perhaps a tweak from there} .. I can pan to my hearts content and still have well exposed players and deep dark backgrounds with a shutter speed that is just quick enough for my needs .....
sorry for a long winded reply..but the moral of my story is don't just use M for the sake of Using it...but learn when you need to use it as the dumb black box{camera} is not all knowing ....but in most situations AV mode is most used as I want control over aperture and Im content to let the cameras metering do its magic ..
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