The term opinionated just adds an accusational tone to what we generally call "bad subjective." If you're somewhat familiar with our history, you've probably already seen this blog post:
Good Subjective, Bad Subjective
It outlines quite concisely what type of questions — even those that have some element of opinion and subjectivity — that are a good fit for this site.
Guidelines for Great Subjective Questions
- Great subjective questions inspire answers that explain “why” and “how”.
- Great subjective questions tend to have long, not short, answers.
- Great subjective questions have a constructive, fair, and impartial tone.
- Great subjective questions invite sharing experiences over opinions.
- Great subjective questions insist that opinion be backed up with facts and references.
- Great subjective questions are more than just mindless social fun.
The blog post goes into much more detail and should be all-but-required reading for this site.
Most overly-opinionated questions will be likely be closed as not constructive. If you look at the description behind the close reason (below), it provides some pretty good guidance about when it should be used for questions that don't quite seem to fit:
This question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or specific expertise, but this question will likely solicit debate, arguments, polling, or extended discussion.
If that describes the question you are reading, close it as not constructive. But when you come across a question that is not a good fit, please take the time to leave a thoughtful comment describing precisely why their question doesn't fit our particular style of Q&A.
For folks accustomed to traditionally forums, it's not always obvious how and why a Stack Exchange site works the way it does. We're the odd man out here. Our facts-only learning ethos goes against how most debate-driven, political discussion forums operate. Take the time to be informative and educational. We don't want to portray this site as a bunch of close-happy, censuring fascists, closing questions summarily without followup or helpful guidance.