**Update** Their chicken burgers seemed to have gotten smaller. The chicken filet used to so big that the buns don't cover it 100%. Now their buns more than cover the entire chicken filet. It's still pretty juicy but the dryness of the buns somewhat ruined it. So I no longer have a reason to come here.
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Burgers are hard to screw up. You take a patty and grill it. Then you put it on a bun and add toppings. So the question is really: a) What is the quality of the meat? and b) Do the cooks know how to not over/under cook? The answer is a) pretty good and b) yes the cooks do a decent job.
In particular, I like their chicken burgers. The chicken is more juicy than other places. I had South Street Burger and the chicken burger was dry as sand. But I think that was the cook's fault because I felt he left it on the grill for too long. Jetsun's chicken burger has never disappointed me. Furthermore, I like whatever they are using to season the chicken. South Street's chicken burger barely has any taste if I add no condiments.
My only complaints are the prices and the buns. The buns don't feel fresh. The prices seem really steep. But with so many burger joints around GTA, even small differences can spell doom. I generally don't eat burgers anyways and Jetsun's is not going to be my first choice.