It probably is the best hamburger in the city, except that it comes with a side of INSECT (brown, with antennas, a hard shell, and six legs - CitySearch won't let me distinguish it's kind). Seriously! The restaurant was crowded so we sat at the counter. Just as I finished the first half of my very delicious burger (Western w/ cheddar) the medium sized insect came out to say hello. It crawled around the counter for a while and then scampered away. Sadly, I did not finish my burger, and sadly, I won't be back to Mo's.
Pros: Awesome Burger, Great fries
Cons: Cleanliness, Insects on the table, GROSS Factor