Would also like to notice that calibration isn't the same thing as profiling. Anyone with experience of ICC profiles knows what I'm talking about. Of course a good profile along with a decent screen may turn out rather okayish but you should always calibrate the two point grey scale in order to make the white balance as good as you can. However a monitor with untouched settings will turn out pretty horrible if you run AutoCAL since you'll compensate an error with another error. To make my point clear the results will be less than the whole. I'm not a fan of that solution and prefer to get my monitor calibrated first and then get a good source instead of using the source as an arbitrary reference.
Today most units do output a rather decent image, in fact there's a much bigger risk that the issues you see due to the source is in fact software related (incorrect black levels, color spaces, resolution etc), so getting your monitor calibrated will result in an improved image regardless of usage. Slight compensates with profiling may give you an extra boost in image quality but don't let the graphs fool you. Use your eyes to make sure that every value is distinguishably and aren't shifting in tone. If they do you should certainly look for the issue. If not, enjoy!
If you're a Mac user I'm not sure how friendly CalMAN is. I know they mainly developed software for Windows (which I'm using) for quite some time.