SAS, I think you should look at the people not their nationality. There is plenty of dreadful American management around, plenty of good uk ones. It's just that we seem to have had some poor UK ones and now a good US one. And let's not forget that Bill cut his teeth in the N Sea oil industry of the 70s so he is to some extent a product of the UK.
Did I like being part of an American company? No, not really. It drives me mad that they can't spell, so every time I wanted to reply to an email I had to change the language from US to the Queen's English. And ridiculous safety messages about being sure to stop at the US's favourite traffic sign, the STOP sign. At least we didn't have to go to helicopters whose blades rotate the wrong way (well, some of us didn't anyway).
But am I glad we had Bill? Yes.