Do you think watching a lot of movies is good to improve your language?

Watching movies is a great way for improving language specially when they are not subtitled. Also youtube is a great source for watching small & very useful videos (in any preferable type of interests) to improve language.

Watching movies is a great way for you to improve your English, especially your listening and speaking skills. Films are not usually created for English language learners – they are made for native English speakers. Therefore, the language is exactly how you hear it in real life – it is spoken quickly, with native accents and pronunciation and using many idioms and colloquial expressions.

It is not a good idea to use this as your only method of learning English; it is much more advisable to study at an English school. However, I would definitely recommend all English language students to watch films in English in their spare time for additional practice that you might not get in a classroom.

sure it improve how we speak correctly with good pronunciation 

Yes, watching movies can help improve language.

Note watching a lot of movies with a particular goal in mind can help achieve that goal.

It surely helps, you can also try NEWS channels. You will get information and routine words 

well yes if its with subtitle its more good but the thing which i ll say is to practice it to speak and to involve in it practically .....  and socially....

Its similar like a;

“Beauty is in the eye of the beholder”

In my opinion yes, it’s absolutely right watching movies is a source of learning language. (Now selection of movies with will to learn is your's).

Brain, is an apparatus with which we think, we think. (Ambrose Bierce)

Until & unless you will not give some input to your mind or engage with something how can you learn.

Definitely, this is how I expanded my own vocabulary: watching movies (without any voice over) and listening to songs in a foreign language.

Absolutely. It's what I did to improve my arabic, my spanish. So from personal experience, I can tell you it pays. You memorize the words, you can match the sound with the correct letters, and you discover the 'tempo/speed' of the language.

I think it would help, no doubt. But better than movies it would be better to have some chat´s in some forums or some daily talks with foreign friends )