Sometimes identifying "Canadian" productions gets down to what you want to believe. I know people who will identify a co-production as "American" if they like it, and dismiss it as "Canadian" if they don't. Who knows what the future holds for Canadian genre TV? Maybe on the horizon is a Canadian genre series that isn't just grudgingly set in Canada, but unapologetically so.
Orphan Black is about clones and conspiracies. Part of the series' appeal is doubtless its gimmick. The twinning process -- wherein an actor plays opposite himself -- has been around for decades, but Orphan Black does it better than almost anything before. Even when the clones hand each other glasses you forget special effects are involved!
Canadian series have a history of pretending they're set in America. Where they are supposed to be set -- well, that's a fascinating topic. In recent years we've also seen what could be called the "soft" Canadian setting. Series which admit they are set in Canada but in a way that a lot of viewers probably wouldn't pick up on.