English is a ridiculous language, but I love it for all it's little quirks. Everyone says that it's a language full of contradictions and exceptions to the rule, but they forget that it never started out with any rules. As with most vernacular languages, nobody decided there would be rules, it just arose independently as individuals agreed on various conventions. It didn't have to make any logical sense, as long as it worked to a certain degree. The English language has so many 'exceptions' because it was never really 'designed' or had any original rules.
I mean honestly, at this point, the characters that string together to form words are hardly even phonetic. They only vaguely relate to the verbal representation of the word. You might as well memorize the whole string as you would with a more pictograph style language such as Chinese, and I know that indeed many teachers are adopting this method, rather than encouraging the systematic sounding out of letters that only leads to disaster when the vast chaotic English phonetic is released upon the student and they are defeated with a common word like machine, not to mention the incredible number of words borrowed from other languages.
If an international language is one that should be easy to use, I would say we should use a language that has been 'designed' with ease of use in mind, such as Esperanto. But personally, I'm not a fan of one international language though I recognize it's immeasurable value for global relations and international trade. Esperanto is nice, but it lacks the richness and linguistic history that older languages have despite their disorder. I think writing in the more variable and unpredictable languages is more charming and pleasing. I just can't imagine poetry having the same aesthetic value in Esperanto.