It isn't the OS

"The problem wasn't with the fact that we moved to open source, but that the move was organised so poorly by school management. If teachers had received the proper training and been introduced to the system, then open source could have been everything we were promised. Unfortunately it wasn't." [Ping Wales]

What is highlighted in this article is the single biggest reason software projects fail, regardless of operating system, or technological superiority. It becausease the move is poorly organized (the article is Welsh, get over it) and little or no training is provided to those that need it most and are expected to be productive with the system.