I'll admit to being one of those people does like Peter's burgers and onion rings and shakes over others in Calgary. Heck, I'd rather pay $10 here and have a burger and a shake than wait around in an alley in DT!
I love the Peter's DriveIn Burgers - because they taste like burgers! Strange concept, I know - but to me they taste like something I would make at home and the condiments etc just add to a very nostalgic feeling for me.
Onion rings are second or on par perhaps with A&W's, but generally are fresh and all sorts of deep-fried goodness.
Now the milkshakes -are amazing of course, the best being the rootbeer flavoured milkshake - like the leftover rootbeer and milk you get from a float. Divine! But did you know that you can order a small milkshake which is $1 less, and is a lot smaller - so if you don't want to pack on 2000 calories of goodness, you'd only have to pack on maybe 1250?!
So, there are those that talk about the 'burger' wars from one drive-in/ retro restaurant to another - but Peter's is a go-to for me - open late, consistent quality and service and very quick to move through lines as well.
Peter's - I'm definitely a fan!