I know the reason I have stayed with the Cullen threads for so long is because of the company there. We discuss many things. Most are related to the games as a whole and others are metaphorical where Cullen is the catalyst for such a topic but it evolves to include larger issues. That's why the thread page count is so high. As for his presence on the web? I couldn't say. I'm not on tumblr. Deviantart is the go to place for fanart as far as I'm aware. And Cullen is hardly unique in how much fanart he has.
Now you might be honestly curious and I applaud you taking the time to visit the threads. Admittedly they've been a bit focused on celebrating but we've recently learned he is to be in the game so we're excited, of course.
However, if sating curiosity is the majority of your reasons for making this post, you could have also just asked in the thread. A polite and civil query will receive an answer in kind. You know why I think you didn't? Because there you'd be walking "into the lion's den" so to speak. It wouldn't be a new topic at the top of the forum lists. Other Anti-Cullen supporters wouldn't know you're in there to back you up and you're afraid. That trolling is really 85% of your reason for making this post. You may not mean offense but I find it odd that you expect to have a group of people justify to you why they like something they like and not have them feel offended. Shall I go make "I don't get why people can't see the complex and intellectual story that Cullen could tell" topic? Just for balance?
Whether or not Cullen is special is a point of view and only those that hold it could answer you. Those who share your perspective could only parrot what you already think. Since your opinion is pretty set, you've established that those who have a differing point of view are being asked to defend their perspective. It happens often enough that it's beginning to feel like a trial to me. Ask your question in the Cullen thread. You won't be flamed or snubbed or bullied. You will be answered. You will be debated. And even if this doesn't change your mind about Cullen, you'll learn a thing or two about his fans. 
You are correct, I could have made this post in an existing thread, but I didn't think of it and it didn't seem to fit. As I said, the threads I visited seemed to be about meeting with friends and fan art. Nothing wrong with that, and it could be different on different pages of the threads, but I'm not going to browse through and entire 100 page thread to see if it has conversations about what I want in it. After I browsed several threads on the topic and didn't find what I was looking for, it seemed reasonable to make a new one. That may have been a mistake, but if so it was made out of ignorance, not malice.
As for expecting you to justify your feelings..., well yes and no. Yes, I was curious as to why you felt that way and wanted to know your reasons, which I think is the foundation of any conversation worth having. No, I didn't feel that your feelings were invalid unless they matched mine or unless you could provide logical justification for them. I'm not "anti-cullen" I don't hope to have an opportunity to kill him in DAI, if one presents itself I probably won't take it, but I'm not pro-cullen either, and he probably won't be in my party unless I need a warrior and there aren't any others I like (unlikely with my inquisitor likely to be a warrior and both Iron Bull and the Gray Warden being warriors)
If you were to make a "why can't people see that cullen is awesome thread" (which I encourage you to do BTW, if only for the lulz), I would reply with much of what was in the OP, to me he seems bland and uninteresting, with little to set him apart from other characters in the series, along with the fact that I'm not fond of the "brave with steel but cowardly anywhere else archtype" (cullen, aveline, alistair, etc). To me, there are two degrees of subjectivity in that opinion. (since this entire thing is subjective, there is no objectivity, only degrees of subjectivity. I can't believe I just wrote that sentence, I need to drop this philosophy class.) The first degree is that he is a minor character, with little to separate him from other characters. This IS subjective, but only moderately so. For example, most would agree that he has been a minor character so far. The second degree is that I don't care for the archtype he seems to fall into, and that is utterly subjective and varies from person to person.
And while my opinion of cullen hasn't changed in light if this thread, I have learned more about the people who like cullen. I have learned more of their reasons for liking him, (which was what I was initially curious about and why I created the thread). I have also learned that much of the hype about cullen is a chain reaction, stemming from the content generating content cycle, which is fascinating, informative, and something that hadn't even crossed my mind before I started this thread.
Was I intimidated at the thought of venturing into the 100 page cullen thread? no not really. Did I want to browse through 100 pages of content in order to find what I was looking for? Definitely not. The creation of this thread was more an act of laziness, not cowardice (which I think is reasonable, when you get 100 pages of content, having to search through all of it seems a little unreasonable.)