Latin

I've heard that if you know Latin, that you basically know Italian, Spanish, Catalan, Portuguese, French, and Romanian. I want to know if there is truth to this statement.

>>1
Like others said... you'll recognize in great extent the vocabulary. Not everything... Spanish and Portuguese borrowed Arabic words, Romanian Slav words, French Germanic words...

The Latin grammar however, in this point of view, is completely useless. ALL Romance languages buried Latin case system, even Romanian (that adoptated Greek's case system, simpler).

Personally, I like Latin because of my native lang (Portuguese). If your native lang is English, however, stick learning Old Saxon or today German.