i don't really think english is that easy...personally i think it's the basic grammar that makes english first language worldwide...i mean...it musn't be right at 100%, but most of people will understand it...for example...when you are about to go for a vacation in another country using an another language, it's easier for you to learn some basic english then for example french...
but i really don't think that advanced english is easy...plus, the big role in this is playing the pronunciation...for example me...i was watching a lot of american movies in which, suprisingly, ameircan english was used. I learned a bit of phrases and mainly catch up the sound of speech...but then i went to Britain. It was really hard for me to understnand British because of the accent. I really like it, but honestly i didn't got much from a conversation of native english speakers. When they were talking to me, They tried to speaking slowly and clearly so i could understand.
due to this experince...i think i can responsibly say that for me english isn't easy...i've no doubt that i did a lot of mistakes even in a simple text like this...sorry for that