I've tried a few different burger places in Calgary (including the infamous Peter's Drive In which I have no idea is so popular) and I can confidently state that Clive Burger is the best. My friend Seano recommended this place and if there is one thing that he knows, it's a good burger. Ever since my first visit (a few months back) I've been back almost every couple of weeks.
Burgers are 5 stars
Fries/Poutine 3 stars
Atmosphere 3 stars
Overall: A solid 4 stars (5 if you just want a good burger)
I must also say though that even though most of the add ons are free (lettuce, tomato, onion etc.), the ones you do pay for a ridiculously expensive...$2 for a fried egg?!