I can't argue about it not getting much love in the updates department and its instability under many configurations (though sometimes you can get lucky ;-)), but..

and can do things that RMagick does not, like actual drawings

RMagick has a SVG-related drawing system called RVG:

http://studio.imagemagick.org/RMagick/doc/rvgtut.html

As well as a smorgasbord of drawing primitives:

http://studio.imagemagick.org/RMagick/doc/draw.html