Did not watch myself. No need the concept is stupid on its face.
This is quite ironic, since this:
Puting the two together though is just silly. Superman is for all intents and purposes a god. While not wholly omnipotent, he is so far above man that he can freely toss our greatest war machines around like children's toys and even slow the spin of earth altering time. Batman simply isn't in his league. Additionally Superman's original character was almost Christ like in his unfailing sense of justice and strength of character regarding doing the right thing. The Superman of the early comics would never have agreed to even associate with the Bat,
...was essentially the exact set of issues the movie you proudly didn't watch was addressing.
(Full disclosure: I'm one of the weird 27% who actually liked it)