The graph shown above is an example of a bad graph. First of all there was no need to model it in 3d as it has only 1 x and 1 y axis and by modelling it in 3d it makes it look much more confusing because it is in 3d, an example here is Pliers during the feb- march period user will have a hard time looking at the graph due to the overlapping lines.
If this graph was modeled in 2d it would take less time for a user to understand the graph