It's phenomenal box office anyway you slice it. At this point I don't care as I'm not actually seeing any of the returns, and I'm not even sure I'd like to see this MCU drag out for years on end if quality starts to deteriorate. The product hasn't really been improving since 2008, outside of Avengers. I'd say Avengers 2 has a lot of promise, and if it is every bit as good if not better than A1, then it probably deserves an even bigger box office haul. I get that "deserves" is highly subjective, but I don't feel IM3 deserved its box office alone and was significantly bumped by the Avengers effect. Of course you have to look at the whole. Same can be said for the TF sequels, or even the Hobbit. And the end of the day, you earn what you make, I get that.
At this point its looking like the MCU COULD... COULD... rival the likes of Star Wars and Harry Potter as a movie franchise. Long ways to go. The quality of the films, as those franchises wore along, never seemed to fluctuate too significantly. As long as they can maintain Avengers level type popcorn and entertainment, let these films make as much money as humanly possible for all I care, because that's good enough for me.