Marketing_Guy - 9:06 am on Oct 27, 2011 (gmt 0)
If Google started to penalize web sites because of bad grammar with the user comments, there wouldn't be many web sites left outside of academic ones.
To be honest, generic comments are quite a common spam technique - my blogs catch loads, usually with usernames that are exact keyword matches and homepage URLs that are deep links. So if you've let any of these at all through, it might be worth cleaning up shop.
The autogenerated comment spam aside, there are loads of people that manually "link build" by posting a variety of "me too" comments. I rarely let any of these through.
Pure speculation, but if was Google and I was looking at ways of determining the quality signals of a blog, the comment moderation process is something I would explore. Given I have access to a wealth of information about websites, it wouldn't be too hard for me to (for example) footprint common spam comments and downgrade websites that allow them to be published. Of course, as Google, I'm also a moron that doesn't really care about individual webmasters so there's a good chance a lot of decent quality blogs that happen to have poor comment moderation systems in place will get smacked down to. I'm Google - I rule!