The pizza is okay, nothing to really write home about. The main reason to come to Joe's is you're 1) needing a quick/cheap lunch and work nearby or are 2) drunk. The staff is authentic to New York and by that I mean rude and condescending, but that has never stopped me from returning. The pizza is 3 stars, the price is 4 stars and the service is 2 stars, which provides the logic (when averaged) for my three star review.
Pro tip: come during lunch on a weekday, you get three slices for $6.50.