I travel out of Penn Station frequently, and have made several trips to Rose Pizza (or whatever the official name is) on occasions when an overachieving subway has left me with free time before Amtrak heads south.
Usually the slices are "good". Sometimes "pretty good", sometimes "not quite as good", but always at least decent.
I normally travel on Sundays, though I made last week's trip on Monday, due to Father's Day. I arrived at Penn Station, hit Rose, and had two FANTASTIC plain slices.
The crust was thinner than I'd ever seen it before (even the end was no more than half an inch above sea level). It was crispy throughout, yet still perfectly foldable without any unnecessary breakage. The sauce was bright and tasted fresh, and the cheese had been cooked just to the point of browning. The grease drip was (happily) there, and minimal.
The pie I got my cuts from was fresh out of the oven, and my timing hadn't typically been that good in the past, so maybe that was the difference. I wouldn't advocate mass trips to Penn Station as a result of one superlative visit, but I'll be train-ing home for the 4th of July, and I'll certainly have another go.