The biggest thing that bugs me about Poser is the materials (sorry BB). There is little to no documentation on any of the nodes, what they do or how to use them. Most of us go into the material room long enough to cry and leave again. The preview is minimally useful at best - in order to really see what that great material you just made looks like, you have to render it. 99 times out of a hundred it looks nothing like the preview or even close to what you were hoping for. Glass is a joke - can't even make it transparent, no caustics. Reflections are slightly better, but not great either. And there's no SSS. For folks who render primarly people and skin, this is important ;).

Lighting is another thing. Not that it hasn't improved. It really has. And things like BB's envirosphere and the addition of IDL were very welcome, don't get me wrong. VSS has also been a godsend for those of us who are material room deficient. Even taking all that, there isn't much that I would miss about the material room or the Firefly renderer if it were to go bye-bye ;).

edit: I would really miss dynamic hair and cloth tho...lolol. I wish they would improve Poser in those areas.

Laurie