I'm generally not picky, but Merry-Ann's has become a disappointment for me. You might say "well, it's just diner food," but even for that it's kinda expensive. If you stick to biscuits and gravy you're pretty safe, and their fries and hash browns aren't bad. However, everything is a couple bucks more than I would like to be paying for greasy diner food.
I think the final straw with me was when I ordered a chicken tender plate only to receive chicken nuggets that definitely came out of the freezer: uniform inside texture, only vaguely reminiscent of chicken. I'm pretty picky about mechanically separated chicken. Maybe that's snooty, but I just hate it. In any case, for how much I paid I expected something a little better than that.
For late night food, you're better off making it yourself or even going to Steak 'n Shake.