>Doesn't that depend on how one decides to "score" a language?

Not as much, because not all ways of scoring a language are as good either, and in the ways of scoring that matter, English is better than Esperanto.

In terms of not being a bag of special cases, and thus easy to use, Esperanto is better than English. Like, if you were to design a language from first principles, you'd come up with Esperanto. The only problem is the massive inertia English has, which makes it "better". In terms of design, it's absolute trash. But it's what humanity's got. Trying to learn English as a second or third or fifth language is just so difficult.