The first half is twice as long as it should be and way too dry, but the payoff is worth it.

Rating: 8/10 (24 March 2016)

Without spoilers: the main consistent criticism of the movie is that it's too long, which I agree with, the first half or so of the movie should be half as long as it is, because it's pretty dry, but the payoff is worth it imho. And I actually found Jesse Eisenberg to be a decent Lex Luthor, he does the eccentric, narcissistic asshole, that Lex Luthor should be, well. If you thought that Gene Hackman and Kevin Spacey were good as Luthor, then I think that Eisenberg was on par too. Other than that, the story is decent, there aren't any more plot holes than in other movies, although it's really working hard on setting up the JL movie. Other than that, the rest of the cast is good and it's a really good looking movie.
So the tl;dr version is, if you can get through the first half without falling asleep from the dryness, it's a decent superhero flick. Let's hope the directorial staff will get reworked for the future movies in the DCCU though. But if you ask me there were movies as "bad" as this in the MCU too, so I don't really get this uproar from the critics.