The Imperial Pub has been around forever. One reason I know this to be true is because the only pub that every Ryerson Professor seems to know is the Imperial.
There's a very authentic pubby feel in here, what with its wooden everything and a staff that knows their bar and their menu like they know the back of their hand. The place certainly feels aged, and that age comes off as a charm.
Generally, I've found the Imperial to be a good place to go for a quiet drink with some friends. It's not really where I imagine a wild night, but rather a relaxed evening over a pint or two.