I saw the previews, they made it painfully obvious that the movie would have almost nothing to do with the story of War of the World, and then just to make sure I went over to Rotten Tomatoes and check their reviews (they're a lot less susceptible to director worship, way too many paid reviewers will laud any crap Speilberg puts out just because they love him).
I liked BB, I don't think the first act was dull at all, it established how this Batman was going to be like the original comicbook design of the character and not like the previous movies. It was a Batman movie for real Batman fans, somebody who doesn't like the real Batman wouldn't like it, but that's OK, not all moves are for all people.
Actually I will say AI and Minority report lacked ambition. And ambitious director would have realized that these stories just couldn't have happy endings and would have let the stories end properly without supergluing half-assed happy endings on the end for the sake of bax office. But SS has NEVER been able to do that in his career, he MUST have a happy ending (except for his occasional "message" movies like Schindler, which I'm pretty sure just exist to salve his conscience for making so much money producing the perfect mass market tripe). The only vision SS has for most of his movies is the box office receipts, his primary talent these days is feeding the market, I'll give him the credit he's due for being able to make the type of movie Americans like, but frankly he bores me. And it was clear from the previews and the reviews (both from those who liked the movie and didn't) that WOTW was just another SS movie, and I've had enough of those.