Btw, if the measure for speaking a language is that you can answer to most statements/questions with which you may be confronted, then I may be able to quickly learn a lot of languages. All it needs is "Sorry, I don't understand". 

True but imho the main issue is, at least I find it frustrating, is that sometimes there is some more profound discussion on a certain topic and would like to contribute my thoughts.
Though due to lack of skills and lack of words it is not very encouraging to participate in such a discussion. Especially not when the discussion is (to say the least) a bit heated and things like finesse such as reading between the lines, witty remarks and such are going passed me.
Especially true it seems like native speakers are the only one participating in he discussion. It is not a good incentive to try and brush up my skills (but that is probably just me).
But I digress... usually I tend to get along well enough
