My boyfriend and I tried this place tonight. The food is pretty good, I had a burger and fries and liked both of them. But, a few hours after eating I got sick, and it's pretty obvious that I now have food poisoning. I'm usually hesitant about pointing the finger when it comes to food poisoning, but my boyfriend looked up the reviews and noticed two other customers already mentioned undercooked food and people getting sick. I think it's safe to say something isn't up to par here and the food is making customers sick.
***Update***
My boyfriend was so pissed about me getting sick that he started researching Shake Shack and found quite a few disturbing articles related to food poisoning, including this one:
http://seekingalpha.com/article/3147046-could-this-be-shake-shacks-worst-nightmare
The article explains that Shack cooks their burgers to medium versus well done, which greatly increases the risk of spreading food-borne illnesses to consumers. I'm not saying that Shack doesn't obey all laws and regulations, but I do believe this is why myself and so many others are getting sick, and it's something people should know before deciding to eat there.