Assuming you are shooting RAW,not out of camera JPEGs, it sounds to me as if you need to use different default settings for you RAW converter. Most RAW conversion programs have their initial defaults set up to be very conservative, with very little pop. All it should take is setting the processing the way that YOU like it, and save that as you new set of default settings in your RAW converter. If you are using out of camera JPEGs, then you need to change your default processing settings
! Usually most folks have the camera setup to produce an image with decent amounts of "pop", although again you can change it, you have different Picture Styles you can use, as well as settings for sharpness contrast etc. I have my 50D set up with Faithful as the picture style, and the four adjustable settings set of 0, -4, -4, 0. This makes for a very flat conversion, actually most people think that the Adobe default conversion is pretty flat, and complain that when the software goes from showing the camera's JPEG conversion preview, to the default Adobe version it makes the image look dull and flat. For my settings, the Adobe default, using the Adobe Standard profile actually makes the image pop compared to the OOC JPEG. So which ever way that you look at it, I would say that you need different default conversion settings, be they in your computer's RAW converter, or the one built into the camera. It is these settings, where ever you chose to apply them, that will make a difference to how the image looks, your metering mode and other non processing settings will not really make much difference. Also where are you looking at the images? On the camera screen, or your computer? The camera screen is not really very good for this sort of evaluation. If the computer, is your system correctly colour calibrated, because that and the associated use of the correct brightness/contrast settings, will make a huge difference, as will using good software that can actually work correctly with colour management systems. The default windows picture viewer is actually pretty awful, and doesn't do colour management (I think) at all.
Alan