It was great. The Knightmare scene and Justice League cameos (except Wonder Woman) should've been cut out, but overall it was fantastic. Definitely better than Age of Ultron, Iron Man 2, and the Thor movies at least.
I'll give it that, it's certainly far more
ambitious in scope and theme than almost anything in the MCU. I respect what DC is
trying to do a lot more than what Marvel is doing, which has a fundamental shallowness to it.
The problem is, they're failing at it, and one of the main reasons is that their writers just don't get what these characters are supposed to be. Batman was not Batman, Luthor was not Luthor, Superman was barely Superman, and Wonder Woman was just a glimpse of what she should be (I'll reserve my judgment until her own movie comes out, though). It's a terrible, terrible missed opportunity, and it's all the more frustrating because I'm a DC fan and I'm rooting for them against Marvel.
