Moz rolled out a new brand-level metric, which is fine. But this idea is far more valuable:

Brand value is highly subjective. It’s most accurately measured across multiple attributes, including financial, trust, and popularity. As marketers and stewards of the brands, you help orchestrate – because you can’t control it – the perceptions of your brand over time. They are the sum of promises kept – the spaces in which your customers create their value and look at you in a different way.