I approve all commentary on any hub I put up.
I personally find that when negative comments are made on my hub, there are usually people (some fans, some not) who will retort, even if indeed I don't myself. I typically will, though. (lol)
I should add that I don't consider someone disagreeing with something I've written a "negative" comment per se. If someone disagrees with me, I consider that the moment for healthy debate-which can/has sometimes cause/d me to alter my particular stance on an issue.
If someone makes what I do consider a truly "negative" comment (e.g.-personal insults, unneccessary vulgarity) I am actually far more apt to attempt to chide them into an actual constructive dialogue.
It's all about healthy exchange of opinions and educational moments for me.