Here is the thing, a lot of people do enjoy those movies. Why? Because DC has this incredibly large fanbase. As a kid who grew up watching Donner, Burton and Timm, who loved reading about Clark, Bruce, and Wally I get it. I am a DC fanboy. I sat through years of Smallville. Even if a lot of people do not like these movies, DC have an incredibly large fanbase. It is why TDK and TDKR broke a billion without 3D.
It is why even with all the divisiveness of MoS, BvS and potentially SS, they make a lot money. Now they spend a lot of money too, but that isn't the point. It is actually incredible when you think how many people know Harley. How many people love the Arkham games. DC is pop culture.