Ok, thanks both of you. You are both right, I will elaborate.
Airports have cool lounges, fun shopping (sometimes), Nemiroff Vodka 1 ltr for 7 Euro (KBP), Museums, Video mail, meet interesting people (frum people also traveling accross the world to/from different continents but intersecting there, people of different culture and language, cool security apparatus :-) and more.
If you have free time - no rush to get to your destination, like such stuff, it may be for you. If not, not. It also depends on how many kids/seniors you are flying with and the timing for jet-lag...