But that way you are throwing away the only benefit - that it works without javascript. It's really expensive to draw graphs and it's better to be offloaded to clients.
I can't think of many reasons for building them serverwise.. except for when you don't have access to javascript or you are limited by the power as well.
I disagree, as even if you did use Javascript the service is still far more accessible to a novice developer than something like the d3.js library (which I love, but has a rather steep learning curve).
Additionally, you would be surprised at how much could be accomplished in that department with just CSS.
