I'm from the States, so I'm well aware of what good Mexican food is. And I was somewhat skeptical it could happen in Canada after my previous experiences. I was pleasantly surprised to find that Wilbur Mexicana was a quality taqueria. The food was fresh, and there was a decent variety of tacos, burritos, and the standard fare. They weren't as spicy as I had come to expect from the menu (maybe that's a Canadian thing), but that was easily resolved by the hundreds of hot sauces available.
On the downside, the line can go out the door during the lunch rush hour. It didn't seem like they were processing customers as fast as they could. Also, the layout isn't conducive to a lot of people eating-in: There are a number of huge community tables but they are not efficiently used by the customers, nor efficiently placed by the designer. Finding a seat may be a challenge during lunch. These all resulted in just a single point deduction. Otherwise, I'd definitely recommend Wilbur Mexicana as a good taqueria for a casual bite.