Generally I'm not too hung up on whether food's authentic or not. Sometimes it's interesting to try an authentic version of something to compare it with what you generally come across, and it can be interesting to try different countries' takes on foreign foods -- Mexican food is Spain is not the same as Mexican food in the Netherlands, for example, and Thai food in Britain doesn't taste like Thai food in Australia.
One exception is perhaps separate recipes that haven't been converted to another culture's tastes, but are close copies of the original. I'm thinking about various pasta dishes or paella, things like that. The recipe in another country used might be identical to the recipe used in the original country, but it will often not taste the same. If you eat the food in its original country or region, you're eating it as it was originally conceived: using the authentic ingredients grown in or raised on local soil, with local wine to accompany it, and in the local setting. I'm not trying to sound snobby, but it does make a difference if you've been breathing the local air all day and then eat food made with herbs that you've been smelling and meat from cattle raised on those herbs.