Some good points here.

To be honest, I'm quite impressed with the overall quality of comments on Steemit. Yes, spammy comments are an issue, particularly if they get rewarded. But ever take a look through the comments of a popular youtube video or news article? Usually about 95% crap.

Here on Steemit we have no central power to take care of problems like this, but the community is doing a damned good job of self-regulating. You are right, we all need to do our part and ignore or downvote bad comments while rewarding the good ones. But maybe we should also pat ourselves and each other on the back a bit for how well we are doing already. :-)

Cheers.