There are a few potential problems which limit the significance of this: 1. There is not a universal definition of what defines a language and what is simply a dialect or a regional variation; this applies especially on large continents where there can be greater variation in language features between geographically remote locations, but no clean boundary at which you can say people speak one or the other language. 2…
English is thus - for all intends and purposes - not weird.
A more interesting approach would be to take larger languages, like English, Mandarin, Spanish, etc. and value their features higher than languages spoken by tribes or very few people, and thus you could determine a more accurate 'weirdness' index out of that.