Sub-domains are a problem

Hot on the heels of a brand (spammy) new site getting millions of pages listed in Google, is this:

Want to see Craigslist really rockin the house with subdomains look up [queer forum], that's gotta be 95 out of the top 100! Need another example look at [wedding forum] and scroll down to number 50 or so. You'll see Craigslist jammin' with subdomain dominance controlling about 50 listings! More...

Google need to spend more time and effort on their core business - search. I have a blog site that ranks very well because it is a subdomain of the blog service that hosts it... nobody links to it, but as the subdomain of a PR7 site, it does well. A simple tweak of the algorithm could easily fix this problem...