I have a sentimental attachment to Restaurant Saigon, because it fed me on so many cold winter night after hours of study at the library. But even when I was starving, I stuck to only two dishes: pad thai (beef or chicken) and fried rice (beef or chicken). The rest of the menu is not really good, in my opinion. Even with these safe options, I found that the freshness of the meat was variable, and so was the proportion of veggie/rice/meat/seasoning. It gives the impression that the cook is perpetually in a bad mood, not paying attention, and using lesser quality ingredients. That's a shame, because it's McGill's closest asian food joint.
The vietnamese coffee is ok, but it takes some time to prepare. Don't get the pho.
P.S. The owner has really good memory, and remembers most regular clients. He's not very chatty though.