Too bad, too noisy, too scattered. Not to sound "high brow" (adjusting my clunky, yet attractive eyeglasses) but the menu was bulky with food made with one or too many unique ingredients. Simplifying would help. Also we had reservations before the theater (seriously, but hardly artsy elitist) and by time we had our entrees, the noise made in near to impossibe to chat.
I read that some found the staff tough to deal with. Our server was good (although for some strange reason she introduced 3 times). However, the hostess seemed to lack that welcoming, first impression that is needed in a restaurant.
Probably won't be returning. Didn't find reasons to give SixPenn Kitchen a 2nd chance.