IMO, the biggest drawback to Poser is not even the lousy render engine.  It is the lack of actual artistic skill needed to make a render.  If you don't know basic composition, lighting, and HUMAN ANATOMY how can you presume to artistically portray the human figure?  And, then there is the lack of realisation that skin, or anything else, for that matter has channels.  A 4048x4048 color .jpg just doesn't do justice to the actual nuances in skin.  People have fun with Poser.  It is inexpensive.  Good.  But no one has to really take the time to learn about edgeloops, or s curves, or diffusion channels, and, most folks don't bother.  I feel that there is a general assumption in the Poser community that if something was purchased, it must be of good quality.  I see so many textures, specifically, that are anything BUT convincing.  And, those folks who slap a Vicki in the middle of a scene and surround her with a ton of pre purchased photoshop actions....well, that isn't as bad as the folks who oooh and aaah in the gallery and say...."NOW THAT'S ART".  The community is also a good part of the Poser problem.  Why does no one ever say....centering your figure and pointing the camera dead straight on may not be the most effective composition?

When the Poser gallery gets more images like this one http://www.zbrushcentral.com/zbc/attachment.php?attachmentid=35943  I'll play in Poser again.