Worth the full $50. Just an amazing game. Great story, fantastic controls, and one hell of a view when you're sitting on top of Avengers Tower or the ESB. Remarkably accurate Manhattan too, though my old workplace was cut in half in terms of size.
I got the Collector's Edition and I don't normally buy those, and this game was completely worth it. It is the first open world game I've ever played where you actively avoid the fast travel system because getting there is half the fun. And the DLC is fantastic.