I just returned from visiting relatives in the Toronto area. I usually expect the cities of other countries to have superior transit to the United States -- because that's the cranky way I think. And Toronto's transit system is decent -- it has nice clean street cars, buses and subway stations.
BUT -- you have to take the bus to Pearson International Airport. See this site. If you can't spare the time for the bus, you have to cab it, and depending on where you're coming from, a cab ride can be fearsomely expensive. According to "About.com: Canada Travel," getting to downtown Toronto from Pearson by public transportation takes 1.5 to 2 hours. A cab ride costs $40 to $50, plus tip. To get to Toronto's little downtown airport, on an island, you have to take a ferry.
This made me stop and appreciate what we have here -- we can take the L to BOTH airports. Which is very convenient and very cool. The line to O'Hare opened in 1984, the line to Midway in 1993. So take a moment to be grateful, Chicagoans. Then you can go back to your regularly scheduled complaining.