Criticism on something that you've made from a complete stranger or criticism from someone close to you? Of course, it can hurt both ways. Me?...
In punctuating a rhetorical question you can use a ?, !, or a period. It depends upon what you want the dialog to say. But usually, in writing...
If it begins a sentence, write it out: One thousand three hundred people attended the conference. Otherwise: The attendance of the conference...
Sometimes in older writings, when a number of characters are speaking as if from a crowd: From J Conrad's "The Nigger of the Narcissus" He just...
Separate names with a comma.