Personally, I've never viewed the Canada Post superboxes as "eyesores" or "ominous". They blend into the typical Canadian streetscape and are no more remarkable than street lamps, signs, artificial concrete sidewalks or paved roads.

As far as security is concerned, as someone who lives in a household where no one is around the take the mail in during the day, I'd much rather have something confidential delivered to my locked superbox down the street than have it delivered to an unlocked mailbox near my front door that anyone can access freely.