they dont supply the paper and blu tac you use to stop the plastic on plastic friction that all tablets suffer.
applying paper between the stylus and the tablet is mandatory if you want decent curves.
otherwise use a mouse and do your line art using a vector based package so you can tweak and retweak all the lines with bezier curves.
the most adaptable tool for the tablet is when you are tweaking photographs of models for magazine layouts, the rest can be acheived with better distinction using mouse and beziers.
wacom tablets are by far the best i have ever used in many design firms.
I use a graphire at home but soon stepping up to a desk mounted monitor that you draw directly onto the screen with, mostly for show to the client but also for practibility.
The smallest graphire and the largest graphire are not as good as the medium sized one, you end up mapping off most tof the larger ones to a smaller space anyway when doing real work.
If no-one gives your an answer to a question you have asked, consider:- Is your question clear.- Did you ask nicely.- Are you showing any effort to solve the problem yourself 
