Sorry to see the previous reviewer have such a bad experience...maybe it was an off day?
I have been here twice, and had great experiences both times. Big Al's Diner is truly a small "hole in the wall" type joint, but don't let that deceive you...their food is rock solid.
My favorite dish (both times there) for breakfast has been the corned beef hash, a plate piled high with potatoes, onions, green peppers, shaved corned beef topped off with two eggs (I go over easy to enjoy the runny goodness). Coffee is endless and tasty and the service prompt and attentive, but not overly so.
Would eat here again without question.