IMHO, this isn't even possible in a useful fashion. There are too many levels, too many nuances, and too many varying personal valuations of specific benefits.
Unless you live in a particularly competitive market and fly route patterns that are roughly equally served by multiple carriers - say, halfway between O'Hare and Chicago-Midway such that Southwest, American and United all have appeal - pick the carrier that gives you best services you value, schedule, and price.