My only objection to tapas is that they often seem like an excuse to charge 1/2 as much for 1/4-1/3 as much food. That's probably not completely fair as there's probably less "filler" than a typical main has. In any case though I find tapas meals tend to be on the pricey side.
It absolutely is. Also keep in mind that profit margins in restaurants are razor-thin, and prices really should be higher (and they are getting higher in reality).
On the plus side, tapas restaurants are usually 'gastronomic' restaurants, so more effort is put into every dish than a typical meat + 3 veg main course.
What does that mean? I don't see how a price 'should' be anything.
Also we started to bring our children to good restaurants of different cuisines when they could sit through dinners. (Of course, no restaurants that explicitly say "no children".) We shared all the dishes. Well, it is more that we encourage our children to try our orders. They have developed very good tastes on foods and the appreciation on different cuisines. They both started ordering "adult" dishes at 9 years old. No more chicken tenders, mac and cheese, etc. It is really one of the best family time that we sit together and all enjoy trying local cuisines when travel aboard.