Let's get back to the question at hand rather than a sign that Joey Vento put up in his establishment.
There's lots to love about Philadelphia:
1. The culture and history is second to none (perhaps Boston has a shot at this as well). Olde City boasts everything from the Constitution Center to the Betsy Ross House to Independence Hall and so forth. On top of this, you could spend days in the museums, like the Museum of Natural Sceinces, the Art Museum (please don't do the Rocky thing...it screams tourist) and the Franklin Institute.
2. For a second-rate Northeast city (as a native, I know this and own it), the food is surprisingly good. Morimoto, Buddakhan, El Vez, Alma de Cuba, Rouge, Devon, 500 degrees, Whiskey Bar and so forth are merely some of the options. University City has good and cheaper places to eat as well. The Starr Group does a good job at diversifying and feeding our appetite.
3. The cost of living is CONSIDERABLY lower than New York and lower than DC, Boston and so forth. A 1 bedroom on Rittenhouse Square (arguably the nicest area in Philly) would run perhaps $1500+. You could not even touch that in the UES, UWS or Back Bay. Furthermore, parking is also much more reasonable...even in Center City.
4. Proximity to New York, Baltimore, DC and even shore points allows you to take trips to get out of the city often. The Bolt Bus can get you to NY or DC in about 2 hours and (from what I hear) is a pretty good experience. 30th Street station is also an option.
5. The Neighborhoods are pretty distinct. Take a walk through Elfryth's Alley in Olde City, head to a tour of Eastern State in fairmount, student watch in University City or experience the hipsters on South Street. There really is omething for everyone and, unlike NYC, everything is pretty walkable.
6. Cheese steaks and Tasty Kakes. Really enough said. If you want a good cheese steak...head to South Philly for either Pat's or Geno's. The northeast has Ishkabibbles (spelling?) and South Street has Jim's. Also Tony Luke's is on Oregon Ave and is worth a try. If you're not a native, I suggest not getting the cheese whiz...I am a native and am not partial to it. Tasty Kakes are a joy you need to experience for yourself...check em out at any Wawa or 711.
7. Cabs are so much less expensive than NYC or Boston. You can never underestimate this...especially after a night out. A cab from the stadiums (South Philly) to Center City could run as little as $15 if you get the right driver.
8. Shopping: for high-end shopping hit up Rittenhouse. Walk down Walnut Street and you'll find everything you need from Burberry to AX and Lacoste. Boutiques and even Condom Kingdom line South Street. University City also has a nice shopping area for the students at Penn. We have basically everything New York does, just smaller and scaled-down.
9. The parks are also nice. Fairmount park is MUCH larger than Central Park and anything really available in Boston. Be careful though, portions can be a little seedy and I try and not head in there too much after dark. Wissahickon Park is close by...as is Cooper River Park, which is nice for running (although is in NJ).
That being said, do not venture into North Philly, far West Philly and even portions of Northern Liberties (besides the Piazza). Crime is rampant in some of those areas and it's best to just stay away. I guess every city has that area. Stick mainly to University City, Center City, Olde City and so forth and you'll be totally fine. Philly has a bad rep, but I have never really felt unsafe at all in those areas.
If you have any specific questions, feel free to ask.