I went here for lunch recently and regret going. I chose an outside table because the weather was pleasant enough to justify it. The waitress seemed cheerful, but inexperienced. She took a while just to get my water and when she was taking my order she got distracted by a couple of her "friends" who were walking past the restaurant. She called out to them and started up a conversation with me just sitting there waiting for her to take my order.
After five minutes of this nonsense, I decided I had enough. I firmly reminded her that I was a customer and since she was on the clock, I was to be her priority. Her friends walked away, giving me the evil eye. She rolled her eyes at me and proceeded to take my order. I ordered two slices of pepperoni pizza. After 40 minutes she came back with a vegetarian pizza. i calmly pointed out that she had gotten my order wrong and she disappeared for another 20 minutes. Another waitress came out and apologized for the bad service, asking me if I wanted to wait a little longer for my lunch. I said no and left the Mellow Mushroom.
No sooner had I exited the door I was practically cornered by some homeless booze hound. He wanted spare change, reasoning that since I was "rich enough" to eat here, I should be able to be able to spare him a little money.
The whole experience ruined any good impressions I had about Mill Avenue in general.