I'm sure there's better resorts in the world, and definately drier powder. But, for someone who's only been to a small number of resorts in the world, I can say, my Whistler season was the best thing I've ever done with my life.
While finding decent, affordable accomodation for 3-6 months is hell, and when groceries and drinks are over priced like sin, you feel like it's not worth the time. Then you get one blue bird day, you're on the first lift up 7th heaven with your best mate, there's been 25cm overnight, and you bomb the first 3 runs without seeing another person apart from the lifties, fresh tracks down the groomers, cutting through and getting buried in the trees and traversing accross to the bowls, trust me, it's worth it.
It's not for everyone, most resorts in the world are built to cater for people there for one reason only, skiing/boarding. Whistler has been built to cater for people who will incorporate a week's snow with shopping, day spas, an immense variety of great food and a killer nightlife.
P.S. don't expect to meet many chicks, the nightclubs are a sausage fest most of the time.