I have just come back from YVR and that place was amazing. Very bright, colourful, and with a real native-indian theme throughout.
Hong Kong is pretty amazing as well, with fantastic links to HK Island.
I quite like CDG as well.
Worst - probably my home LHR. Overcrowded, dark, dingy, unorganised, the tube sucks, Heathrow Expense is well expensive.
Great aircraft at LHR though!
My vote would be for YVR though!