There are more self-praise than real stuff. To learn French to appropriate level, that native speakers could understand you without a pain takes a whole life, especially when started not so young.

It is just a cognitive stuff - it is very difficult to distinguish where the one vowel ends and next one starts when you're listening to a native speaker and almost impossible to articulate correctly such difficult and beautifully sounded language if you started to learn after 25-30 years old.