Similar issues has been discussed before, but from my limited look around the site (I haven't been very active recently) it seems to me that the site has moved in the opposite direction. So let me remind a few things.
You should not down-vote answers simply because you disagree with the opinion expressed in them. This is not an Islamic site, this is a site for learning about Islam.
Muslims follow different schools of thought and there are many disagreements between them. You should not down-vote an answer because the opinion expressed in it is different from the opinion of your school. Any answer that expresses a view held by Muslim scholars (particularly the large schools of thought) are valid answers unless the person asking the question has restricted the answers he or she is looking for to answers from a particular group of scholars or Muslims. We are not trying to decide which opinion is the opinion of the true Islam, the site is about information about Islam.
Like Wikipedia, this site makes no guarantee of validity, and does not offer professional advice (particularly fatwas). Treat information you find here as if it came from a crowd of your friends.
Looking a bit around it seems there is serious intolerance on the site between people belonging to different schools of thought. This does not create a friendly environment for learning, it creates an environment for fighting.
Let me remind what System Down wrote:
What is a real Muslim? All Muslims think of themselves as real Muslims. [...] Filtering answers according to the person's beliefs (or lack of them) is highly discriminatory and bordering on ad hominem attacks. Answers should be judged on their own individual merits, rather than on who the answerer is. The SE format should take care of that.
Also as Flimzy what wrote:
Islam Stack Exchange is not a game show. We aren't here to vote people off the island. For the purpose of this site, please assume that the answer to "is X Muslim?" is always the same as "does X self-identify as Muslim?" It's the only way a group with such diverse cultures and beliefs can get along and do something productive.
As such all opinions held by all groups who self-identifies as Muslim are acceptable answers here and should not be down-voted for the sole reason of disagreement with the opinion. You can ask them to clarify that the opinion belongs to a particular group and not shared by all Muslims if it is not clear from the post, but you should not down-voted just because you disagree with their opinion.