Quiet frankly short comments are annoying, but I think its a problem with steemit and not necessarily with the comments themselves. Another thing I've noticed is that the top-most comments get upvotes and its usually the comments below, (which have a much better content) that get ignored.

You might want to offer some sort of service where people can INVITE your bot, it would also be a way to have the community join in. On the other hand, people don't really seem to care about low quality comments as much as we do.