Post-capture processing is a fact of life in digital photography. Compacts and dslrs recording images as JPEGs will do this automatically, according to the camera's settings or your menu choices.
Shooting in RAW, no adjustments are made to the data recorded by the sensor, so at the very least, a choice of colour space and some saturation and sharpness adjustments will be required, even if you have nailed the exposure values.
How the histogram looks for any given image will depend on the subject's tonal ranges and how you decide to render them - there isnt really a 'correct' exposure other than the one that looks right to you, so if the image looks how you want it too, then you've got it right.
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