There's one thing I don't get: why do people who dislike the character bother to visit this thread? I mean, I get why trolls do it (for obvious reasons), but why do people who just hate/dislike him come here? If I dislike something I just don't go near it or waste my time talking about it.
I would understand it if they don't like him but want to discuss characters and their flaws while keeping an open mind about the other side of the discussion, because that's what discussions are about, right? But from what I've seen it's normally just a case of popping in to add a negative comment that can't be discussed or really thought about at all? I think?
It does leave me scratching my head at times. I guess because I normally just shrug and practice avoidance when I dislike something and because I haven't found a Bioware character that I've disliked with the burning passion of the sun. I can't even say I hate Udina or that one reporter from Mass Effect, because I can still appreciate what their characters mean in the narrative and think about where their character is coming from-- or appreciate how I can civilly hand them their arses. And sometimes I feel like the only one that doesn't hate Isolde and want her to die a horrible bloody death. 
Just to chime in late on this, I actually appreciate people who don't like Cullen stopping by to discuss him. It is a discussion thread, not a fan thread, and ostensibly the "official" discussion thread, which means everyone is welcome. It's interesting to delve into the problematic aspects of his character, which his fans do as well. So long as it's a discussion and remains respectful.
Agree 150,000% with everyone's comments on how foolish the haters and trolls are to bother coming by to rattle our cage. Spending even one second to tell us how they're going to murder knife Cullen is just a waste of pixels, bandwidth, and everyone's valuable time.