Wow... Someone is really hating on Poser. 

2) It uses valuable CPU resources rendering the slow & clunky interface. -  Read the system requirements to run Poser 8.  If you have more than the minimum requirements then clean the spyware and background programs that are eating your system resources.  I run Poser 8 on a computer with 2.5GB RAm that I purchased almost 10 years ago. I can render, surf the net, and chat on yahoo IM without any crashes or freezes

3) It takes a million years for objects to become visible in the library pallette. - I had this problem when the crappy adobe flash came out.  But I haven't had the problem after adobe corrected the issue. It wasn't a Poser issue.

4) Poser wasn't designed for a HUGE library, it's a mom & pop app for people who have like 5 figures and a hat.  As for the HUGE Library -  Everything has to be done within reason. If you have a HUGE library then you may be overworking your system which means you need to upgrade your system to handle he extra load. The more powerful you computer is the better Pose will run.  Once again not a Poser Problem.

5. There isn't a button that allows you to turn off all IK. You have to go one by one and turn them all off which takes at least 10-20 seconds.  It gets annoying after a while. - This is a very minor and borders on laziness since there are only 4 IK options. 2 hands 2 legs.  It would be like complaining that my toilet doesn't flush by itself or that the doors on my house are automatic doors.  Out of everything that could be wrong, this one is very low on the scale and has no effect on the way your render looks or the speed at which Poser Renders 3D content.

6) Models break in the arms all the frickin time and I have to do symmetry to repair the broken geometry.  I have never had any of these problems with Poser 5,6,7,pro, nor 8.  Sounds like an installation issue.  Maybe file corruption, but once again that's a computer issue and not a Poser issue.

7) Poser crashes often with heavy use. I have to save every 5 minutes to be safe.  What do you consider heavy use?  Maybe your computer can't handle heavy use?  The last time I checked, "Save Often" is the unwritten rule of the computer no matter what program you are working with. 

8) The basic preview render is slow & clunky and it's difficult to move objects around.  The lowest render setting for me finishes in less than a minute. 

9) Even if you turn on fast mode there is always a GIANT box in your way so you have to waste all your time finding out which object is the box to make it invisible.  I don't know of this GIANT Box you speak off unless you have the options at the bottom where you can see a wire version or a block version.  if that's the case then just change the settings so you can see what you are doing.

Instead of complaining try asking for help.