Is the Commission drawing the districts well regarded by all the parties? From what you say its not full of Grits trying to keep the Libs in power.
Yes, all the parties send observers to the commissions and MPs can have their input on where the lines should be drawn but in the end there not drawn to maximize partisan advantage. As you can see from today's election, it means a change of power in Canada IS possible. There was a time before the 1960s, when Parliament drew the riding lines but it was open to charges of gerrymandering and favoring the party in power that it was abandoned for the present system. Interestingly enough, it gives small parties a chance under the country's plurality past the post system to win some seats. Gerrymandering of course wouldn't even be a remote threat if the country adopted some form of PR and that may happen before the next election. Anything to vanquish the prospect of permanent Grit hegemony would be welcome.