Its naive to think that garbage on either end will result in a clear conversation (even for humans).

Nicely put, though it's all a matter of degree. If a particular site makes sense to people at all (and badly authored sites can still be understood by those who can access them) then it would be nice, utopian even, if computers could see that in a structured and meaningful way. Having said that, what I really wish is that people who ought to know better picked up their game and actually learned the craft.