I can see Razgon’s point. Discourse has been fine but I often miss the ability to turn off avatars that vBulletin presented. I know I can do it now with CSS modification or 3rd party scripts but it is not quite the same.
On vBulletin the site was so clean since signatures were not allowed and I could natively turn off Avatars. That let me focus on what members were actually saying rather than whom was saying it. I focused more on the content of each comment. The overall site was mostly text at that point and was discrete and elegant. The best part of QT3–intelligent minds conversing about games–shined through quite well.
Please don’t take this as a criticism of Discourse, mostly just a humble opinion; also I am a nobody here. :-)