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Our goal when deploying virtualization was to increase server utilization while saving money. There have been cost savings, but less than anticipated. It required a lot of effort to implement, as you are experiencing.
A recent article in Information Week noted that the foundation to successfully utilizing analytics has 3 components: "instilling a data-oriented culture, hiring or developing managers who are information literate, and maintaining analytics expertise at the staff level." At this point, I am finding that third piece of the puzzle to be the greatest challenge, the unemployment lines are not exactly filled with folks that truly have expertise in analytics.
Apparently my observation of mixxed results are not alone. You might find this article of interest: