When travelling almost everyone wants to enjoy a local meal. It's part of the travelling experience. If you're not careful you may end up in an expensive, "extremely" tourist oriented place, which may not even represent the local gastronomy.
How do you pick a restaurant? Where do you search for information before travelling? are there any good on-line guides?
on the spot what are the dos and don'ts? do you ask locals? is that a good source?
Note: The problem with locals is that sometimes they try to be extra nice with you and will send you exactly to places you want to avoid. They don't eat in those places but it's common that they think it's a nice place for you since it's always full of tourists :)
One of the problems with most review websites is when restaurants go into a positive spiral. They get attention for some reason. From there, they will atract more visitors due to their position and, of course, those visitor will review them again re-inforcing the spiral. That means one may be loosing other, maybe even more interesting possibilities, if only looking at "tops"