I have to agree with Bald Eagle as far as the Guinness is concerned.
When you live and travel overseas, you get to sample a wide variety of Guinness. Most of which is certainly not what you would expect in Ireland.

However, I can almost always put this down to the impatience of the barman (Beers are much easier to pull, and you can sell more of them in the time it takes to pull a decent pint).
Proper care of the lines is very important also, and the distance from tap to barrel is critical.

I have tasted excellent Guinness in my travels, as well as chalky crap, heavily disguised behind the Guinness name.

A few notable 'Guinness' Pubs:
Vaughan's, Chicago
Paddy Go Easy, Åboulevarden, Århus, Denmark.
John D. McGurks, corner of 12th and Russell, St. Louis.

Caring people who care about Guinness!

B.