I for one would enjoy the ability to delete random/unhelpful deck comments. I was constructing an in-progress janky deck that someone immediately commented upon to tell me it sucked. In order to delete that random unhelpful comment, I'm forced to copy the deck and then delete the old deck. That's fine, but it seems weird. I'd prefer not to have to fork to new versions of a deck when somebody hasn't had their morning coffee and needs to troll my terrible decks.

That is a valid point you are making. I will take it into consideration and try to provide better comment control for the owner of the deck :)