I think the secret ingredient in Port-of-Subs sandwiches is crack. Seriously. I crave it every day but I've forced myself to go only once a week.
I don't understand the two star rating. This PoS is in a bad neighborhood, but is very clean and anytime I come in, the crowd is uniformed services workers (cops, firemen, mailmen, etc...) and the atmosphere is chill.
When I go (which is usually lunch, I work Downtown) there is a fabulous server who is always in a great mood, but not so over the top that it's annoying. Everyone I've encountered who works here is in a pleasant mood and works very quickly.
The best part about Port-of-Subs: unlike subway, their bread doesn't get stale while you're eating it. And you can get your sandwich grilled in a panini press, which I think is way better than toasting.