Needless to say these aren't terribly troubling, generally the worst they do is to pollute my logs with crap. The main problem with these sort of "attacks" is that fear mongers will use them to justify giving them lots of consulting money.
What does annoy me about these attacks is that while they are fairly ineffective I would still love to see a concerted effort to nail the people who do them to the wall. I see it like those people who aim laser pointers at airplanes.
That said, there are genuine attacks from sophisticated but unless the companies involved have political pull these attacks too go unpunished. What bothers me the most is that these attacks originate from a very few countries. How about we shut those countries internet connections down for a few days until those attacks stop.