In online debates, real life conversation, news articles etc. (the list goes on), I've seen 'opinionated' used as a criticism of people, and I personally don't see it as a bad trait, at least not an inherently bad one.
I generally find that people who are opinionated enjoy debate, have strong views and engage with a number of topics, and are often more enjoyable and interesting to converse with than individuals who are either disinterested in many issues, or else avoid voicing the opinions they have. Maybe that's partly a result of my being quite outspoken and passionate in discussions and debates, but I certainly gravitate more towards people who are openly passionate and candid about their own notions.
I understand that certain opinions are inappropriate or inadvisable to voice in particular situations or around some specific individuals, but in no way do I believe that being outspoken or opinionated is overall a bad trait. That's especially true if someone is knowledgeable and/or passionate about a subject being discussed. I find this idea that keeping opinions to yourself is a naturally polite thing strange as well. Politeness is the art of being thoughtful, tactful and phrasing things in a non-antagonistic manner, not avoiding giving an opinion on issues.
How do fellow ADISCers feel about this? I realise I might be in a minority with the above stance, but it would be interesting to hear what others think of being opinionated or of interacting with people who would be considered 'opinionated'. In other words, I'd enjoy seeing your opinions on this!