Yes, I have done it in the past. Watching films in English has improved my language skills in this foreign language (yeah, English is really not my first language, guys!). Got a better understanding and securer in talking and writing and it has increased my knowledge in vocabulary. In other words: it was the best what I ever did. It made even fun! whenever I have enough time, I am watching films in English language again, be it in British or American English.