I did read McMahon's CV at the time he was appointed. It was certainly good, but not the most impressive I've seen.
Although I'm an computer geek by profession, my work has brought me into contact with many business people at many levels, including some that work in Mergers and Acquisitions. There is a huge difference between running a business day-to-day and negotiating a takeover deal, and in my experience, that's the time to bring in the experts.
McMahon definitely did not appear to be someone with experience in those kinds of deals.