Until the recent hiccup, machine translation was harming me with over $300/day in revenue.
Yes, the translations can range from acceptable (Dutch, Spanish) to awful (Russian, Greek, Arabic). But, they certainly are better than no translations at all.
And that's really what machine translation should be compared to -- no translation at all. Why? Because it's not as if anyone would translate all of these documents manually. If done manually, very few documents will ever be translated.
Would I automatically translate my most important documents, like the sales pages for my business? Of course not. Would I manually translate tens of thousands of pages of original content into a dozen languages, knowing that some pages will only be read once a year? Of course not.
It's all about using the right tool for the right job.