From: Jedediah Frey on
Checkout the updated version of saveppt2. It gives an option to copy the plot as a bitmap, which means it should look exactly like it does in Matlab as it will in PowerPoint.

Plots will look a bit different because they're actually 'pictures' now instead of the Metafile, the PowerPoint presentations will probably be a bit bigger as well.

http://www.mathworks.com/matlabcentral/fileexchange/19322-saveppt2