I got bitten by this problem once: http://productforums.google.com/forum/#!topic/docs/t7MZYkHnL... . Essentially, one fine day, google docs couldn't draw a scatter-plot that connected the plotted points with a line (the feature got removed for some reason). From the timeline of that thread, it took months to get the feature back. This is just unacceptable. Ever since, I have decided to stick with a native app for office software (excel on win + mac and some other stuff for Linux).