First of all, sorry to bring up a slightly old thread.
to lolwiki: just add more widgets using wp’s appearance tab and set each gd star widget to display only on certain categories. (filter>article category).
to the rest: Yes, the documentation is not as good as it can be. Yes, it actually takes some sort of php skill or at the very least some patience to actually customize a website/ blog.
In most cases the problem is not with the plugin or WP devs but with users who expect to find a magic “create my website button”. Stop complaining and start researching a bit. If you just can’t seem to grasp basic php/jscript/whatnot then give up and get someone else to do it or pay for it.
So far, GD star rating is a premium, highly customizable plugin that costs $0. Before it you either had to hand-code your own or pay serious cash for a custom implementation.