I don't think a judgement of a person for themselves is possible, because we don't ever meet a person on a forum, in the flesh (or if we do, it's quite rare....)
I think the only way you can make an effective appraisal of a person is to see whether they make sense in what they say, whether they talk kindly or rudely, and whether they are consistent in their "appearance"...That is to say, do they say one thing in one place, and another thing on another forum/thread, or are they quite consistent with their opinions and views?
You might not always agree with what they say, nor might you like the content, but everyone has a right to post and state their case, just as you have a right to accept or reject what they put forward.
But if their posts are sincere, well-intentioned and considerate, then we simply have to decide whether we agree, and trust, or whether we disagree.
I have found for myself that sometimes, if I have read something i'm not quite sure of, I feel more able to make a valued assessment if I just read and re-read their posts, and take a step back.
For example, a poster on another thread has actually put it to me that Buddhism is brainwashing, and I think this was an extremely valuable and debatable point of view, one to which I gave quite bit of thought and consideration before responding.
My initial reaction was quite defensive, but then I realised I was taking her comments too personally, and there might have been something in what she said. To an extent, she had a point, but this was more in isolated instances, rather than as an accurate statement and general concensus.....But it was most thought-provoking and interesting.
Nobody on here, to my mind and in my opinion, ever takes the subjects we discuss either lightly or disrespectfully.
(Disregarding spammers, flamers and trolls....!)
I think this forum is very special for that.
Hope this helps, Das.
Nice question.