Book Review Problem

I have been posting book reviews, partly because someone might find them useful/interesting (though I have no evidence that's true), partly to show that there is life beyond the internet.

Now I am faced with a little dilemma: what's the point of posting a book review, in English, of a book I read in Portuguese that has never been translated into English? Maybe I'll have to take the plunge and write in Portuguese, or just give up on the idea completely. If I do write it in Portuguese and someone feels it necessary to correct my grammar, I just hope they do so by email, rather than putting comments for all the world to see.