I suppose it isn't illegal but more often than not, your submissions will be rejected because of their low quality. That is, unless, you're submitting to mediocre article directories which aren't worth submitting to anyway. A better option would be to actually spend 10 minutes or so rewriting articles. Even if you do produce bad stuff, it'll probably be better than what any article spinner can give you (unless you seriously suck at writing). Cheers
mediocre sites may be useful in the future....what if they'd jump from pr2 for example to pr 6 in the following months?