I lived in philly for a time a couple of years ago. I think the foody scene is hyped amongst the youngsters. All my friends used to love Giannas grille. It's this place off of 5th or 6th down by south. Everything there is apparently VEGAN...I've eaten there a couple times but would hardly say it's breathtakingly awesome...then again i eat meat so soy pizza, cheesesteaks and oreo cheesecake is much better when it's not..umm made of soy.
my friends also loved the buffet at the reading terminal market...cos it's cheap (but that too is nothing to rave over)...Apparently now in university city there's a cereal bar restaurant that serves nothing but cereal. Clever and tasty..but not exactly fine dining.
Basically philly consists of a lot of vegan, I believe somewhere my friends even said there was an ethiopian buffet (now if there were ever an oxymoron...that'd be it)
Plenty of chains...cosi's dot almost every other corner...a couple hole in the wall places...bad chinese food...even in china town...and even if you ate at any of these places and enjoyed it..i don't reccommend visiting again..as I've seen MANY MANY roaches and rats...crawling on squagles in the rittenhouse square area of town.
The only place I enjoy eating in Philadelphia...aside from picking up some cheese and meat at the italian market in south philly...
the undisputed king of cheesesteaks.
hope I helped :)