Five guys burger are not very good. If you want to eat good burger in Montreal, go to l'Anecdote, Maam Bolduc or Zazium.
I think tastes are a personal thing. Personally, i love the Five Guys burger. Unfortunately for me, i no longer eat burgers or hot dogs. But i guess this is a good thing. I want to lose 30 lbs by the end of the year & this means no burgers, no hot dogs, no fries & no pasta, among other things. Basically, no more eating crap! I don't want to get to a point where i can't even see my own dick when i'm pissing or need a mirror to trim my own pubic hair!
As for the places you mentionned, are their burgers under $7? If not, i'm not interested. I will not pay a crazy amount of money just for a fucking hamburger!! I can make the same fucking hamburger on my Napoleon barbecue grill for under $2. I will not be a victim to grossly overpriced burger joints! It's just a fucking hamburger, for christ sakes!