EM is a global company and as a thinly disguised management training school (a bad one at that) it's not so surprising that senior managers come from many countries. I don't think the concept is necessarily a bad one. Indeed, in a normal environment, such diversity of cultures and perspectives would be a real plus. Unfortunately the re-programming that senior managers undergo within the EM system, seems to rob them of any credible management skills and it all becomes a race, and josteling for position to see who can be next CEO.
In my time at EM I don't think I saw any evidence of good management....just a lot of very ambitious folks who's own careers were the single focus of everything they did. Still amazes me that it was allowed to work the way it did. Hasn't worked out too well in the end though!