It would have been five stars except they're so busy, so I had to wait 15 mins in line just to order and then another 10-15 to receive my food (in my opinion, too long to wait for a burger).
Having said that, there is a reson WHY they are so busy - their burgers and chips are INCREDIBLE! A burger and a small chips will leave you absolutely full as a goog 'til dinner. They have loads of options, small snack burgers if you're not that hungry, kids' meals, vegetarian and even gluten free ($1.50 extra though - rip off).
I love that further down the back they provide decent reading materials (Frankie, Yen, Daily Newspapers, Drum Media, etc) and that on Mondays and Tuesdays there is a student deal that you get a free drink (speaking of drinks, if you like a beer with your burger, you can get that, too!).
For a 5 star dining experience I suggest you go between Wed and Sun if you prefer a quieter dining experience, and to ring ahead and order if, like me, you hate to wait.
Take note, Grill'd, I like you, but you only got four stars because you could be cheaper (especially for Coeliacs), and you could do coffee.