Hardest languages to learn as second languages

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Every once in a while, I think about languages and which ones would be hardest or easiest to learn as second languages. It makes me realize I'm glad English is my native language, because I think it's probably a really hard one to learn as a second one. It has multiple sounds for each vowel, a few consonants with more than one sound, a consonant that can also be a vowel, weird combinations of letters that make still more sounds, unnecessary silent letters like those in knife or thumb, and so many rules that it doesn't even follow it's not funny. I mean there are always exceptions, but English has so many of them that it can even be a headache for a native speaker. In fact, just earlier today I encountered a word I didn't even believe was a real word, but I looked it up in the dictionary and it was. I've also noticed that very few people who speake English as a second language pronounce words correctly, often are uncertain how to say things, and use broken language. This isn't entirely their fault, and shows that they are at least trying, but it is a difficult language. I have no sympathy for those who don't even bother to try, and expect everyone else to bend over for them, but if someone genuinely makes the effort, it's cool. So what do you think are the easiest and hardest languages to learn as second ones?