Being a big curling fan, I had to see this movie the day it came out, and I was not disappointed. I thought the swearing was a bit crude on the first viewing, but when I watched it a second time it didn't bother me. You don't have to be very knowledgable about curling to enjoy the movie, and I don't think you have to be Canadian to understand the humour, but a few of the little in-jokes might be lost... like the "Hinterland Who's Who" segment playing on the TV in the bar. ;)
Peter Outerbridge shines as James Lennox. The humour is great and quirky, and the friendship between the characters is nice. This is one of the best Leslie Nielson roles I've seen in a long time, where he got the chance to be funny, but wasn't slapstick to the point of being utterly stupid. Besides, you have to love a movie with a cameo by The Tragically Hip.
It's a bit rough around the edges at times, and I still don't see the point of Michelle Nolden's character (Julie Foley, the astronaut) at all.
Overall, it's worth watching, and the soundtrack is great.