Well aside from the highly unflattering angle you chose for the Nats Park picture, I'm not going to deny that PNC has a nicer skyline view, but maybe I'm in the minority on this one - I go to game to watch the game, not stare at the skyline. Skylines makes for nice souvenir pictures, but the parks themselves are what I care about. Seating comfort, views of the field, ease of getting about, accessibility of concessions, etc. I think any reasonably new park is going to do fine in those areas, and from what I've seen there's nothing terribly special about PNC in that regard. Events are again not a matter of the park itself. I won't comment on that because again, I really don't go to ballparks for anything but the game.
I'm by no means saying that Nats park is the most awesome park in baseball, I just don't think that PNC is *that* much better. Camden is kind of a dump, honestly. Every time I've been I'm struck by how cramped, dark, and dirty it feels. And that's not Nats favoritism as I attended games at Camden before the Nats even existed.