It would be great to have a single page listing movies and their IMDB ratings that are currently shown in your country. This would then make it fast to decide which movie to watch.
This feature exists and is linked from the main menu at the top of each page as "Showtimes" -> http://www.imdb.com/showtimes/ (and is on the home page of our apps and mobile site).
You do need to be located in one of: Argentina, Australia, Canada, Chile, Germany, Spain, France, Italy, Mexico, New Zealand, Portugal, UK or US for this to fully work; other locales may work but are not guaranteed.
Outside of these countries, worldwide release calendars are available at http://www.imdb.com/calendar/ (see countries on the right).