The location and patio is the difference maker here. Positioned right next to the east entrance to Piedmont park, it's probably the best spot in town to people (and dog) watch. Hang out long enough, and you might just spot the likes of the Midtown Pig, the dude with like 12 pit bulls, or the Ambassador of Mirth himself - Baton Bob.
Obviously if you're looking for authentic Mexican this isn't your place, but for California style burritos and such, I consider the food at Willy's a step up from Moe's and Chipotle without stepping up in price.
Pros: good cheap eats, people watching
Cons: no beer on tap anymore, parking can be tough when nice out