I also lean towards non-mandatory voting, but I'm more ambivalent. I'm intrigued by mandatory voting. I'm doing a study with a colleague in Brazil where it's voluntary to vote from 16 to 18, compulsory from 18 to 70, and then voluntary again after 70. I find this very interesting.
I think there are good reasons to tell people they have a duty to vote. There's a good book, Full Participation by Sarah Birch, about the virtues of mandatory voting. I'm still on the side that believes we should just try to make it as attractive as possible. I would be in favour of Elections Canada's mounting campaigns to try to convince people to vote, but I'm still a liberal.