Search for country AND media. Many countries have a whole article devoted to the media in that country, which should give you an indication of the openness of media in that country.
The Committee to Protect Journalists promotes freedom for journalists across the world by tracking and publicizing attacks on members of the press around the world. They publish a yearly report, Attacks on the Press, available on the CPJ website. You can search the site, or browse attacks and reports by country
Reporters Sans Frontieres (Reporters Without Borders) encourages freedom of the press by reporting acts against journalists and media assistants around the world. They compile a yearly Press Freedom Indexand provide reports by country on the level of freedom for journalists.