This is a very interesting perspective on Dynamics AX 2009 from Lee Pender and the RCP: Microsoft Dynamics AX: Feels So Good.

One reason for the traditionally high ERP failure rate is organizational adaptability. With Dynamics AX 2009's easy user interface, this normal challenge for most organizations will be greatly reduced. Therefore, all else being equal, this will increase the likelihood of project and implementation success.

A second reason for ERP failure is that new deployments often take longer than expected to deploy. Now, if end user training can be streamlined, it can take less time during the final stages of the project.