I agree buying pizza buy the slice is almost always never good I even wonder where the hell do they get there ingredients because the cheese does not even taste like mozzarella and the pepperoni don't get me started on that...btw pepperoni is a north american invention which does not exist in Italy..like everything else in this world you pay for what you get!
As long as the Pizza isn't sitting too long I actually like eating pizza's by the slice, even better than personal sized pizza's. Also it depends on where you get it, there are a few places I have been to where individual slices are freshly cooked. If you can find any in Montreal that does so, then you might want to try one. Thankfully there is one that makes pizza by the slice that way where I live in downtown Columbus, Ohio near where I work. It's also one of the only places in Ohio outside of Cleveland, where I have gotten real mozzarella on Pizza. Most commercial Pizza shops in the U.S, such as Pizza Hut use processed mozzarella, that lacks the stringiness that real mozzarella has, and most of the mom and pop shops don't either anymore.
Actually I liked the two samples of Pizza in Montreal that I tried. One was an Italian Restaurant that I think was on St. Catherines, or near it. It was pretty close to the Crepes place if I recall. The other was a walk up pizza slice place that was about a block away from the Hotel Le Crystal I stayed at. Both were a lot better than the typical Pizza's I get in Columbus, Ohio, especially the Pizza slice place, which if I remember even had the stringy mozzarella I like. The restaurant on or near St. Catherines had a calzone like folded bread that was delicious. Then there was this nice more upscale Italian restaurant nearby that had one of the best Gnocchi dishes I had in years.
I also think it's funny that some people here have complained about Pizza in Montreal, especially since Pizza as we know it is a North American Invention, and started showing up in the U.S. and Canada, about the same time and wasn't imported back to Italy in the current form until the mid 1960's. Every area thinks their's is the best, the most entertaining is the competition that goes on between the Chicago Style vs. New York style that seems to never end. About the only style I can't stand is California Style, which is starting to show up in Ohio and to the horror of my friends in New York state, in Albany and Buffalo.
My maternal grandmother grew up in Calabria, Italy in the 1920's and 30's and my maternal grandfather in a heavily Italian Neighborhood in Philadelphia and later Cleveland. Both grandparents, along with my mom who grew up in the 40s near Cleveland, told me many times, that when there was no such thing as what we call pizza now when they grew up, or in my mom's case not until she was a teenager. Now that I think of it, this probably explains why I like Pizza in Cleveland better than Columbus.
The closest thing they ate was a flat bread, similar to foccacia, with olive oil, herbs and maybe some vegetables, but it wasn't a complete meal. These "pizzas" had no tomato sauce and no melted cheese on the bread, the only cheese on the bread was grated Romano. Tomato sauce, cheese and pepperoni was added later. My mom made me this a few times and it's pretty good, but unfortunately I haven't been able to find it in any restaurants. About the closest would be bruchetta.