Now that depends on where you go. McDonalds,Burger King,kebab shops & various other establishments all serve very different burgers!
Well, I had one at a kabob shop and it was pretty bad. But, understand, American beef and UK beef had completely different tastes...that much I noticed right off. Even the McD's I had...and I'm sure they have their beef ported in...it had a different taste. Couldn't put my finger on it, though...