Re: English is one of the easiest human languages...
> Native English speaker here, and I also think its the easiest language in the world.......
That is because you are a naive speaker.
For non-speaker English is quite difficult. More difficult than, say, Italian. Just the fact that spelling is quite random makes it really hard.
> If pronounciation of the new language is not too dissimilar to the native speaker, then probably the most important criteria in classifying it as 'easy' is does the new language sentence structure follow the native one.
You are wrong again.
The most difficult and time-consuming part when you actually learn a language is to learn vocabulary. So the farther away the language is from your native one, the more difficult and frustrating it is to learn. There is no magic way to go around learning the vocabulary.
As for pronunciation English is not easy for speakers of other languages. Plus it is more difficult to listen compared, say, to Spanish or German due to its pronunciation.