The first time the lady and I went here, back in 2004, I thought the burger was one of the best I had ever had. Well, I've since had the best burgers that New York, Chicago and LA have to offer, and I can say that while the Allen's burger is tasty and well-textured, it's not exactly earth-shattering.
Also, "We also serve what are widely considered to be Toronto's best burgers" = most Canadian sentence ever written on a menu.
So...
+ great beer list, including 10+ local Ontario craft brews in addition to the "house" brew (brewed by Amsterdam Brewing Company)
+ pretty good burger; if you've ever had DuMont Burger in Williamsburg... it's like that but not quite as good
+ classic Irish pub ambiance
- pricey
- fries blow
- service not great and server not very helpful
- hard-to-read beer list
- menu hasn't changed in 5 years and still doesn't list the burger... which is what they're famous for
In sum: if you're in the neighborhood and you don't mind overpaying for an overhyped burger and some decent suds, do it. But if you're going to make a special trip, save yourself the heartache and buy a bus ticket to New York.