Really when it comes down to it, most real people aren't simply going to be good/evil. Different situations will elicit different respones from people. Whether its greed, lust, power, laziness, etc., everyone's got their weaknesses as well as their strengths. There's also the matter of motivation and justification; the same action can be good or evil depending on your reasons. Just a simple number isn't really going to be that enlightening. Okay, great, on a scale of 0 to 100 on the morality meter, I'm a 50. What's that mean? I'm totally passive and never take action to help or harm others? I live a life of debauchery but give money to starving orphans? I preserve the lives of the people of an entire kingdom through the indiscriminate slaughter of people from another, equally large, kingdom? The D&D system if anything is at least a little more descriptive, even if it does lump people into a few categories that may or may not give the whole picture.