Personally I agree that scalability is a better metric for enterprise attractiveness than raw size. Investors agree. CSC has a P/E ratio of 5.8, whereas Microsoft's is 12.9.
The list also just feels mistaken, but that might be my misguided sense of enthusiasm for shiny companies. Fiserv is a $6B company that I had never heard of. I'd probably rather go long on Facebook or Twitter, but a savvy investor might disagree.
Berkshire Hathaway: Core competencies = Warren Buffett, AAA credit rating, willingness to keep former owners on as managers. Monetization = insurance, furniture, candy.
WalMart: Core competency: Logistics management, supplier bargaining power. Monetization: every household good imaginable.
Nike: Core competency = advertising. Monetization = sneakers & sportswear.
Actually, seems like companies with wildly disparate core competencies and monetization schemes tend to do pretty well. Or maybe it's selection bias, and the ones that do well do really well but the rest fail miserably. Either way, I'm waiting for some company to close the Google -> Nike loop by leveraging their expertise in sneakers and sportswear to sell lots of software.