I agree that in LFPB the differences are marginal and the service usually not fantastic but "good enough".
However, I disagree with Jet Jockey A4 insofar as some Euro FBOs do provide some of the best service anywhere in the world. I'm thinking TAG EGLF, Grafair ESSB, Swissport LFMN, Mallorcair LEPA and others. Your average North American FBO may be bigger and fancier than many in Europe but the service is not necessarily always world-class in my experience. However, your average FBO experience in North America is usually at least satisfactory, and usually better, whereas in Europe in can and does vary from dreadful to outstanding.