Honestly, it makes me feel pretty bad, Not because I don't think I can pass or because I'm jealous. It may help others, but not me. It did help me initially, I was shocked! some of them looked really pretty and I didn't really think it was possible until I saw those threads.
Personally, all I really care is my own validation, I'm a strict judge of my own appearance (not so much on others' appearance), and I'm pretty good looking right now as a guy, and from the little time I've spent as a girl (in private), I think I look good enough. I'm glad I took my looks from my mother that's all.
I cared about looks a lot, and I still do. Sometimes people on those threads pick out the smallest of flaws, like foreheads or hairlines, when there are many women with high hairlines out there who look perfectly good and feminine. I do however, like the supportive posts that say "You have potential", or posts that are honest and state that there is more to being a woman than passing.
I can't single out this forum, it's just the way the world works, prettier people get more attention, some like it, others see it as a curse. We are pretty shallow, people are judgmental and they can only judge you by appearance if they can't get to know you. Once they get to know you, appearance becomes secondary, until then appearance is all they have.
I don't think these threads are bad though, transgender sites are a safe haven for trans people starting out, it's like a trial run here before they gain enough confidence to go outside or go full time, whether or not they actually pass, if it helps them live, I think it serves it's purpose. Having said all this, there are certain trends on those threads that I don't like.