As an Emerald Member, the pick up is GREAT/5 Star. Just walk across the street and pick up the car. Very fast and convenient.
Drop off is great for Emerald members because you can leave your car and receive an email later with your bill, so if there is a line of cars waiting to get checked in, you can just leave the keys in the car and go.
The bad part about this location in particular is the Toronto Airport signage. There is a rental car drop off at both Terminal 1 and Terminal 3. Sound convenient, except there is no signage telling you that there are two drop off locations, or which one you actually need to go to. This is more of an airport problem than National problem (all rental car brands have this problem), but it needs to change. It is the only airport in the world I have been to (and I travel frequently) that does not direct people to the proper terminal or rental car facility.