i just made a test post on the first link you posted above, it seemed simple enough. the only thing i can see that could maybe be a little cleaner about the look of it is i don't know if you really need those couple lines below the "discuss" title above comments. it feels like it's explaining how to comment, which most people on the internet don't really need these days
. you could probably streamline it down to just the "Discuss" with the subtext "visitor insights and feedback", and one sentence saying "Please review our Terms of Use & Policies before posting a comment."
edit: disqus seems really nice and easy to use, i like how there's nothing more than a name and email required, makes posting a lot faster the first time.