The abundance of irregularities in the English language can be frustrating at times, especially, I'd image, for those who are not native speakers. Too many words are exceptions to otherwise logical rules, but I think the most frustrating inconsistency in the English language is the multiple pronunciations of the same combination of letters.

That said, as English is my first language, I don't often have many difficulties with it. I learned a long time ago not to attempt to find a logical structure behind the English language and just love it as it is.