I live right above the Military Park station (you might recognize the tilework in my avatar if you've ever been there), so I've got a lot of experience with the subway. Really, the frequency is perfectly adequate on the main line during weekdays, except for toward the very end of the evening. The weekend schedule is inadequate, at least in part because they typically run the Sunday schedule all weekend, for reasons they don't seem to explain. Lately, they cancel departures on the weekends due to "operator availability." That's the Sunday schedule and they can't operate it.
The Broad Street line, on the other hand, doesn't have sufficient frequency to make it useful at any time. If a departure happens to work for when you happen to be traveling, it's a good option. Apart from that? Useless. And it's a shame too, as it was expensive. To give you an idea, the best headway all day/all week is 10 minutes, and there is only one of those: 4:29 and 4:39 PM from Penn Station on weekdays. There isn't a single other headway that is as good as 10 minutes.
|=| R. Novosielski |=|