When you go to the public pool, you don't complain about not being able to play golf, do you?
StackExchange is a Q&A community website. Although sometimes discussion would be appreciated, it is not what it was meant for.
And by all means, if you find an accepted answer to be wrong, downvote and comment it! The whole point of StackExchange websites is to rate questions and answers!
I think the person is simply frustrated because he realizes that StackExchange could be so much better. I quit a few years ago when they changed all question upvotes to be only worth 5 points, but rejoined about a year and a half ago because it's still the best existing option.
When asking questions, I try to make them good enough so that other people will find them useful in the future, and it's great when I get a like-minded answer. Some examples:
Still, I think StackOverflow could be taken up a notch to allow more collaboration and organization. Also, wouldn't it be great to be able to provide runnable source code in some sort of git archive? For some languages like Javascript the code in the questions/answers could be in something like http://jsfiddle.net
Ideally, a group of people could pick any topic and essentially write several books (beginner and advanced) by asking lots of questions. At least that was my initial belief. Say, for example, you wanted to learn elisp, and you typed: "Hello world in emacs", well I've got that answered:
StackExchange is a Q&A community website. Although sometimes discussion would be appreciated, it is not what it was meant for. And by all means, if you find an accepted answer to be wrong, downvote and comment it! The whole point of StackExchange websites is to rate questions and answers!