Now, although the results are based on objective criteria, I can't really claim it's anything but a subjective analysis, partly because I'm the one choosing the criteria and setting the parameters, but mostly because I don't know what the hell I'm doing.
Anyway, I threw a tool together that takes your blog URL, submits it to a series of publicly-available tools that each analyze a different aspect of your blog; the results are mashed together by a proprietary algorithm that takes into account those objective factors and mixes it in with all my biases and judgments, producing a result of dubious quality.
Give it a try and let me know what you think.
Automated Blog Analysis and Review Tool (v. 0.9)
(Joelogon's Blog Analysis and Review Tool was inspired by the Brunching Shuttlecocks' Mr. T Name Generator)