[tablespoon]

> About the same %, i think. The only difference is russian language can absorb almost anything, applying usual rules - so newly imported words are feeling native almost immediately

That's probably it: it's not the origin of English's vocabulary that makes it difficult, but its bad habit of not adapting borrowed words to conform to the English system.

If English speakers would rework spellings and plurals to match English when borrowing a word, it would be a lot easier for everyone almost all the time (the only exception I can think of is the rare situation (of questionable utility) where an English speaker can recognize a borrowed word in its foreign context).