I was just reading a thread with 26 comments at least half of which was a single comment full of spam. That's a lot of scolling on a tablet and it will probably only get worse.
I don't look forward to playing whack a mole with spam bots (I not so fondly remember the heights of GNAA spam on /.) but I'd at least like the ability to hide it when it's at a low level.
For posts, please filter the spammer. It'll remove the posts from your feeds, and is a step towards globally filtering the user. We might need to move the filter link to the feed to save navigation time. We need to implement a similar solution for comment spam. We will do that.
Well, comments are a bit something else, but people here are relatively vigilant marking spam submissions with the #spam tag, so a good place to start would be to filter that tag out. As for spam comments, bring it to the attention of mk or insomniasexx and they'll take care of that.