It's what it's supposed to be (sort of), and that's always good in my book.

Rating: 5/10 (31 March 2016)

Note: this is an edited review, which lowered the score by one, since I've now have a better understanding of why people seem to hate this.
Usually when I review a movie/game/book/whatever, I review it; but, this time, I will just write a simple, stream-of-consciousness-esque opinion, moments after leaving the cinema - something that I do for the first time. The reason? While I avoid almost everything that can spoil/affect my opinion, a couple of days before going to see this movie, I was surprised to see so much HATE towards it, especially from (the scum of the earth) "professional" critics, who expected Lars von Trier, and got a superhero movie instead. Is it perfect? No. Will it become an iconic classic like The Dark Knight? No. Could the plot, the acting, and the overall direction be better? Sure but a bad movie?
Read the title: Batman V Superman: Dawn of Justice. It wasn't supposed to be a colorful, funny, and fast-paced Marvel flick it's supposed to be a clash between two gods in a far darker setting, it's supposed to have a villain who can actually trick these gods, and it's supposed to introduce the Justice League. Has this film achieve all this? HELL YEAH. In many ways it reminded me of the hate that Man of Steel received, which, to this day, I don't understand why and this comes from someone who isn't exactly very fond of Superman.
There are indeed some major flaws here, though. I won't go in detail about some, such as why Lex behaves more like Joker, or how some characters have been reduced to cardboard ones like Lois Lane, amongst others, so I'll only mention the three big ones. #1: The rivalry between Sups and Batman is insanely forced, and the way things turn around is, admittedly, silly. #2: Doomsday looks bad, and should not be here so soon. Every comic book fan know that this dude is an extremely important part of Superman's lore, so it should get its own separate movie. #3: the biggest mistake IMO is that DC tried to do a lot of things to soon it tried to pit Batman against Superman, tried to introduce the Justice League, and tried to include Doomsday.
To keep it short (too late), here is my quick rundown:
The good: fantastic music, a great, dark mood, the best action sequences in recent comic book movie history, solid-to-good acting (even from good 'ol Ben), and, finally, a decent, although, far from flawless, exploration of several themes; especially of how terrifying a "God amongst us" can be.
The bad: Batman's hate towards Superman is bit forced and silly; He should be smarter than the average Joe. Wonder Woman was cool, but her inclusion felt a bit forced. Doomsday should be 10 times more threatening - even general Zod and his team felt like far better team of villains.
In conclusion: Not bad, not fantastic, and not mediocre but, undoubtedly a very entertaining superhero movie, despite its MANY shortcomings.
Literal: 5/10 x 0.40 Dramatic: 6.8/10 x 0.30 Cinematic: 7.5/10 x 0.30
Score: 6.3/10