[dilap]

I don't think you're weighing the "English-as-a-second" language factor nearly strongly enough. While grammar can be a great proxy measure of quality for works by native speakers, it's completely inappropriate for non-native speakers -- the amount of effort required to reach native-level fluency and polish (i.e., at the level of your critique, above) is herculean.

To cite just one example, redis is widely considered excellent software, but much of its documentation is written in a very imperfect English.