I think poser have improved a lot especially in performance. 

However some things would be nice improvements which i hope they will add at some point, which is a localized pivot point for faster workflow. When you are used to other 3d programs you really miss it. Even though you can turn it on, it just feels a bit messy to use i think.

Would also like to see an overhaul of the lighting system, so it was a bit more streamlined with the other 3d apps out there. And so they were easier to control, im not a huge fan of that ball thingy they have and controlling lights in the viewpoint is not easy either i think.

But think these a minor things, when looking at Poser as a whole, it does a really good job in what it is suppose to do.

Working with characters, creating scenes etc etc. is really easy compared to other 3ds apps, where creating a character is really difficult and requires a lot of experience, to rigging it and get the same control you have in poser would make 95% of the users not wanting to use 3d i think.

But following Poser and the new versions that comes, i think it improves quite a lot each version, with the bullet system added, cloth fitting etc. Now they just need to add particle effects, improve the render engine (Even though i think it does a decent job) and it would be really nice.