If you need a quick, convenient translation tool, this isn't it-but if you're looking for a real dictionary or vocabulary tool that also gives you rich context, Linguee is more than robust.
It is, however, useful for people who have texts to muddle through and they're trying to translate them on their own, or people learning another language who need a little help with tricky words or phrases.
It also doesn't offer the spoken word capabilities of other services, so it's probably not best used for quick words or phrases that you may encounter elsewhere, or things like tweets and Facebook posts made by your friends in other languages. While it won't translate documents or web pages for you, you can always type in words in languages you don't understand and see meanings, contextual translations, and other documents around the web where the word is properly used so you can get a feel for how it's used. Linguee is less of a translation service as it is a translation dictionary and search engine.
