Judging by some of the replies and comments around this site their really poor.

The worlds biggest undertaking in translation was by Facebook. It got it's members and users to translate content not a script. In my opinion you'll never get as good a result from a script (even Google) as you will from a fluent speaker.

How much do you need translated. If it's only a page in each language you could probably find people to do it for you easily enough for free. People mightn't mind re-writing a page for you. If it's a lot of content they won't be interested unless their's money involved.