Yep. It's an easy language to speak on a functional level, but very difficult to master on a native level. Lots of native speakers never master all the nuances.
The same can be said for all of the languages being discussed in this thread. I'm skeptical that English is any harder to learn at a native level than French, German or Polish.
I say, on the phonological level at least, French, German, and even Polish are easy. Their phonetics, both the consonants and the vowels, are straightforward. English, in contrast, is out of this world. (Its origin lies in the language of an island nation, after all.) So much so that it looks like their neighbors, the French, have huge difficulty with English pronunciation (and native English speakers, especially the Americans, seem all too happy to return the favor - their atrocious French pronunciation is, in fact, what they are taught, just look at the transcription of French words in conversation guides, it is amazing how bad it is, ‘é’ is transcribed as ‘ay’, etc.)
It doesn't help that we screw with the pronunciation of loan words and then label anyone who pronounces them properly pretentious.
One of the worst destructions of foreign pronunciation has to be Notre Dame. It hurts me to say "noter dayme". More recently, having to pronounce La Croix as "lah croy" has also been annoying. But unfortunately for both of those it's objectively wrong to pronounce them the French way since they are proper nouns and whoever is using that proper noun defines how it is pronounced when referring to them.
The same can be said for all of the languages being discussed in this thread. I'm skeptical that English is any harder to learn at a native level than French, German or Polish.