i have a content type where users can post reviews or comments. I want to achieve this with the comment module and not by creating another content type and using node reference.

So I want to limit the number of comment a user can post per node for a specific type of content type.

Again i also have other content types where i have given the users the option of commenting on article, and that can have multiple comments and replies.

can anyone suggest me how to achieve this? Can i do it through rules(i haven't tried yet)?