Stick to the subtitle-focused sites listed above. These community-driven platforms are perfectly legal. A good rule of thumb: avoid any site that asks you to download a separate "video player" or executable file to access subtitles.
Sites like Subscene often have comments indicating if the translation is accurate. Enjoy the sheer terror of [REC] ! Download [REC] 2007 English Subtitles on OpenSubtitles Rec 2007 English Subtitles Download