I have the problem of not being to many places yet but I will try my best to fill in from the few experiences I have made so far.
-best food: Cyprus- the fresh fruits were amazing there
-worst food: probably London
-best architecture: have to give this to my own good old Germany
-best beach: Cyprus
-most expensive: Switzerland and London
-best for the money: Switzerland
-most friendly locals: Greece
-least friendly locals: London I guess
-best lodging: the one in Cyprus
-best art/culture scene: Greece - all the sights and Athens
-most beautiful people: met some everywhere actually
-best party scene: Greece (I did not get to go out partying in London though)
-best natural scenery: Switzerland definitely
-best weather: Cyprus and the south of Switzerland
-best public transport: Switzerland and London
-coldest: London and my home Germany (esp. right now)
-best overall: Switzerland and Cyprus
-least favorite overall: there was no place I would say I didn`t like, but I did not like the beaches we had in Crete.